〜って
Quoting or raising a topic, casual in spoken languagemachine translation
FormationPlain form + って / Noun + って
って is the "Swiss-army knife" of casual speech, replacing several longer expressions. Its most common use is quoting, in place of 〜と言っていた: 田中さん、明日は来ないって (Tanaka says he's not coming tomorrow).
って also raises a topic, in place of は or 〜というのは: 日本の夏って暑いね (Japanese summers, huh — they're hot). The nuance is bringing up a topic lightly, usually followed by a feeling or comment in the second half.
Finally, to ask the meaning of a word you've just heard, the extremely common conversational pattern is 〜って、どういう意味？ (what does … mean?). All of the uses above belong to casual speech — in writing or formal situations, go back to 〜と言っていました, は, and 〜という.
Examples
田中さん、明日は来ないって。
Tanaka says he's not coming tomorrow.
日本の夏って、本当に暑いね。
Japanese summers, huh — they're really hot.
「いただきます」って、どういう意味？
What does "itadakimasu" mean?