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1.
Possessing drugs to sell
"You got any softwhite?" "Yea, im holdin"
by hustler August 04, 2003
 
2.
When one holds in a fart (squeeze the butt cheeks); often times to avoid embarrassment.
If your hold in fails you must result to a ghost fart.

I was in school holding in all day, then finally I unloaded my explosion at home.
by Pete Wheeler December 24, 2007
 
3.
possesion of a weapon
we runnin up on Fred's house, are you holdin?
by Jolene February 14, 2005