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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
 
1.
Possessing drugs to sell
"You got any softwhite?" "Yea, im holdin"
by hustler August 04, 2003
 
3.
possesion of a weapon
we runnin up on Fred's house, are you holdin?
by Jolene February 14, 2005