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I was reading [the comic strip titled 「エボラ出血熱の巻」 on
スマ町](http://mainichi.jp/sumamachi/news.html?cid=20140902mul00m03001000sc) when
I encountered 「忘れててさ」. I've reproduced part of the dialogue here for a bit
more context (bold mine)

> てっしー：火達磨さん！宿題手伝いますよ  
>  火達磨 ：てっしー！助かるッ！実は夏休みの調べ学習 **忘れててさ** …  
>  てっしー：テーマはエボラ出血熱ですか

I gathered that the second clause is omitted, and that the complete pattern
would be 「Ａてさ、Ｂ」. Based on this, I found [this 大辞林 entry on
てさ](http://www.excite.co.jp/dictionary/japanese/?search=%E3%81%A6%E3%81%95&match=beginswith&itemid=DJR_tesa_-010)
which says

> 〔接続助詞「て」に間投助詞「さ」の付いたもの。(snip)〕  
>  ① 文中で，「て」によって調子を整えつつ，「さ」によって語句を軽く指示し，相手に念を押す意を表す。

I interpreted this definition (likely inaccurately) as

> In mid-sentence, while adjusting the tone with 「て」, lightly indicate the
> phrase with 「さ」, and expresses emphasis to the person one is talking to.

which frankly sounds quite vague to me, especially the 「調子を整えつつ」 part.
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2014-10-27T20:33:56.660
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question
meaning particles
What does the てさ in 「忘れててさ」 mean?
I interpret it as follows. The `-て` is a shortened version of `いて`, so it
should be `忘れていて`. The `さ` is the usual relaxed sentence ending particle,
often used between parts of a sentence to request feedback from the listener.

> ね、僕さ、実はさ、昨日コンビニ行ったらさ、...

So I would translate the sentence as "Y'know, I actually forgot to do my
homework..."
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answer