2
cool; be on top of things; in the know; in with current styles or trends.
"Tyrell has one hella nice new Escalade!"
-"Yeah, that boy's always with it."

~or~

"I'm so freaked out about this date."
-"Dude, will you just get with it?"
by Vesuvius October 13, 2006
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3
To agree with;
Andy: I'll be at the batting cage at 6 o'clock, you still going?

David: With it, Pal. Count on it.
by js83 March 25, 2014
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