a hit off of a gravity bong or the gravity bong itself; short hand term used in substitution of a G.B. (abbreviation for gravity bong)
Typically a jib is made of a small trash can filled with water and a gallon jug (preferably a Kool-Aid or Gatorade one) with the bottom cut off. The cap for the jug should be molded around a metal piece in which weed can be placed.
"Hey Lacey, I'll give you a gib if you take me to work today."
or
"Last night I was taking a gib and I accidentally spilled the gib water all over your chemistry homework!"
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