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I think the individual parts of it are:

• 遊{あそ}ばにゃ → 遊{あそ}ばなきゃ → 遊{あそ}ばなければ (see also 遊ぶ)

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• ってなもん → というなもの

(mainly for emphasis, I don't think it changes the meaning much here)

• だろう (the plain form of the polite でしょう)

I think

• が

though

• おう！

(an exclamation, sometimes translated as "oh!" or "hey!" etc)

...遊ばにゃ損ってなもんだろうがおう！
...遊ばなければ損というなものでしょうがおう！
...It's a loss if you don't enjoy yourself I think though. Alright!

I think that translation loses a lot of the feel of the original colloquial text though.

EDIT: For the time being, I've assumed the "な" was a typo. Also hopefully fixed the exclamation part.

I think the individual parts of it are:

• 遊{あそ}ばにゃ → 遊{あそ}ばなきゃ → 遊{あそ}ばなければ (see also 遊ぶ)

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• ってなもん → というようなもの

(mainly for emphasis, I don't think it changes the meaning much here)

• だろう (the plain form of the polite でしょう)

I think

• が

though

• おう！

(an exclamation, sometimes translated as "oh!" or "hey!" etc)

...遊ばにゃ損ってなもんだろうがおう！
...遊ばなければ損というようなものでしょうがおう！
...It's a loss if you don't enjoy yourself I think though. Alright!

I think that translation loses a lot of the feel of the original colloquial text though.

EDIT: For the time being, I've assumed the "な" was a typo. Also hopefully fixed the exclamation part.

I think:

• 遊{あそ}ばにゃ → 遊{あそ}ばなきゃ → 遊{あそ}ばなければ

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• ってなもん → というなもの

(mainly for emphasis, I don't think it changes the meaning much)

• だろう (the plain form of the polite でしょう)

don't you agree?

• が

though

• おう！

(an exclamation, sometimes translated as "oh!" or "hey!" etc)

...遊ばにゃ損ってなもんだろうがおう！
...遊ばなければ損というなものでしょうがおう！
...It's a loss if you don't enjoy yourself, don't you think though. Alright!

EDIT: For the time being, I've assumed the "な" was a typo. Also hopefully fixed the exclamation part.

I think the individual parts of it are:

• 遊{あそ}ばにゃ → 遊{あそ}ばなきゃ → 遊{あそ}ばなければ (see also 遊ぶ)

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• ってなもん → というなもの

(mainly for emphasis, I don't think it changes the meaning much here)

• だろう (the plain form of the polite でしょう)

I think

• が

though

• おう！

(an exclamation, sometimes translated as "oh!" or "hey!" etc)

...遊ばにゃ損ってなもんだろうがおう！
...遊ばなければ損というなものでしょうがおう！
...It's a loss if you don't enjoy yourself I think though. Alright!

I think that translation loses a lot of the feel of the original colloquial text though.

EDIT: For the time being, I've assumed the "な" was a typo. Also hopefully fixed the exclamation part.

I think:

• 遊{あそ}ばにゃ -> 遊{あそ}ばなきゃ -> 遊{あそ}ばなければ

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• なってなもん -> な、というなもの

(mainly for emphasis, I don't think it changes the meaning much)

• だろう (the plain form of the polite でしょう)

don't you agree?

• がおう

(I think it's one of those colloquial endings used by Anime/Manga characters, I think it can be omitted and the meaning won't change much)

...遊ばにゃ損なってなもんだろうがおう！
...遊ばなければ損な、というなものでしょう！
...It's a loss if you don't enjoy yourself, don't you think!

EDIT: I'm still not 100% on this, but I think the earlier version of this wasn't correct.

I think:

• 遊{あそ}ばにゃ → 遊{あそ}ばなきゃ → 遊{あそ}ばなければ

unless one plays/unless one has fun/unless one enjoys oneself

• 損{そん}

loss/disadvantage

• ってなもん → というなもの

(mainly for emphasis, I don't think it changes the meaning much)

• だろう (the plain form of the polite でしょう)

don't you agree?

• が

though

• おう！

(an exclamation, sometimes translated as "oh!" or "hey!" etc)

...遊ばにゃ損ってなもんだろうがおう！
...遊ばなければ損というなものでしょうがおう！
...It's a loss if you don't enjoy yourself, don't you think though. Alright!

EDIT: For the time being, I've assumed the "な" was a typo. Also hopefully fixed the exclamation part.