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1.
When you pack/stack the cone of your bong. You cannot use this word if you have a home made bong, it doesn't work like that.
Usually a fat bowl occurs when you get home from work or more commonly when you return from school, escape the girlfriend/parents.
Whats the time man?
2:45
Bitch-sticks I can't wait to get home and smoke a big fat bowl.
I hear that.

Where's Gemma
Gave the slip, she's doin' my fucking head in
Well I got a fat bowl for you homes!
Shit yeah!

Every night when George got home Martha would have a fat bowl waiting for him, soon as he walked in the door.
(inaccurate film reference from dazed and confused"

by dat-ting June 13, 2007