Top Definition
adj. someone or something that is liked because its the latest trand and is always there or always available. a trend or action or person that is constantly involved or involving.
-'Who is this knew guy?'
-'John. I've talked to him, he is in.'

-'Are u in or what?'
-'Yeah, I'm in.'

-'have you seen that website'
-'yeah, thats so in'
by De La Serna December 18, 2008
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