Hamaji is asked if his house ever recieves year-end gifts. He says that they get dried shiitake mushrooms. His friends express surprise. One of them says "it's not bad but..." and then Hamaji says:
「悪くはねぇんだよ。うちのかーちゃんなんてすげー喜んじゃってさぁ」
"It's not bad. Our mother ends up really happy" (my TL attempt)
I'm assuming 喜んじゃって is the て-form of 喜んじゃう which is a contraction of 喜んでしまう. I don't understand why it is in て-form or what the meaning of さぁ is. What is this てさぁ ending all about?
This -て and this さぁ are not strongly related, and we can discuss them separately.
Sentence-end -て is often used to make a casual request, and aside from that, it's used to make the sentence "unfinished", and keep the listener's attention.
And さぁ/さあ/さ is yet another sentence-ending particle like ね(え), よ(お), わ.
So -てさぁ basically works as the attention drawer, like you know.
It's not bad. My mom was actually really happy with that, you know.
[て/で]さ[あ] doesn't really mean much, it just emphasizes the speaker's feeling was moved or the speaker was troubled in one way or another. "Trouble" might not be a good word here, as it can mean something overwhelmingly joyful has happened to the speaker.
聞いてよ〜 タカシの奴がひどくってさぁ〜
Listen to me [You know what?] [My boyfried] Takashi really annoys me!
