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1.
to dig or dig it
to understand/appreciate
a way to acknowledge that you follow what you're being told
a: once you turn left off of wisconsin avenue, the road splits, you want to take the hard right...
b: i'm picking up what you're laying down
by WWHS March 30, 2004
 
2.
A phrase to let someone know you understand what they're talking about.
Dude: So then Brenda says she wants to get in the back seat.

Other dude: I'm picking up what you're laying down.
by Nole69 June 13, 2009