mouthing off, talking shit or just being loud.

Quick for running your yapper
Dicky - "What was that guy sayin about Celtics tickets back there"

Biff - "You mean that dude runnin yap at Billys? I don't know, alls I heard was blahblahblah n rarara"
by chrisking5150 December 3, 2010
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When you and all your homeys hit a skank ho one after the other. Where's yo jimmy hat, nigga???
Yo check dis shizzle...me and my crew wuz up in Fitty's lil bro's crib..(Foty) and Mi'chelle wuz drunk as a MUHFUKKA...all them niggas was hittin at'shit....ONE, TWO, THREE......sloppy seconds is good enuff fo'me..

Choo, choo, runnin a train..
by StringerBellch January 30, 2010
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Your best boys, as in your posse. Derived from "running crew," i.e. group or crew of poeople one runs with regularly.
"Yooohooo! Runnin Crew? Where's my runnin'crew?"
Meatwad's runnin crew is made up of the moononites.
by renee March 10, 2005
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An expression used to express total dominance and/or superior skill over a particular event or activity. Used often in sporting events, but also used to express authority over others.
Man, Paul's been runnin' the show all season!

I just got a thousand kill streak again! I'm runnin' the show!

Okay Greg, I'm runnin' the show tonight, so go make me a sandwich.
by Da Big P July 31, 2009
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When sombody talk's shit about some body, you or your homie's shit that usually isnt true.
That nigga be runnin they mouth again!
by W.S Soulja August 29, 2006
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I'm sorry, I haven't called you back, I've been runnin' and gunnin'
by J Cruz November 26, 2013
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