Slang: What does テラス mean?

Question

What does テラス means in the context of declining an invitation, like below?

うううううう！！いきたい！けどその時間帯もろに仕事だ：：：またやって！！テラスーーーーー

I guess it is slang?

I am familiar with テラワロス but it seems different in both spelling and context.

More context: Public comment sent on a night-time birthday event page on a social network. テラス is not her nickname.

Answer 1

So far the only viable explanation I can think of is that テラス is a contracted form of テラワロス.

• ニコニコ[百科]{ひゃっか} entry for テラス defines it as: 3. テラワロスの略
  • 3rd sense: Contraction of "terawarosu"
• a 2ch.net post says:「法テラス」（ﾃﾗﾜﾛｽじゃないぞｗ）
  • "Law-terrace" (and no, it's not "terawarosu" lol)
• a blog post writes: 「針テラス（テラワロスではない。2ちゃんの見過ぎ）」
  • "Hari Tea-time Resort Station (to 2ch addicts: it's not "terawarosu")"

As to why you'd want to "roll on the floor laughing" in the context of declining an invitation, I don't have a definitive answer, but maybe one of these:

• She's laughing at the unexpected coincidence of the event and her work.
• She's laughing at herself for having to work when everyone else is able to attend the event. Perhaps the time of the event is normally considered overtime?
• She's softening the request to hold another event for her by adding a laugh.

Answer 2

I'm Japanese, but I've never heard Japanese people using テラス. That's not even slang. I don't understand its meaning.