To be in the state of intoxication associated with the use of downers like narcotics or benzodiazapines. Sometimes accompanied with heavy use of cannabis.

Gellin is a term used to refer to jealousy.

pronounced: jel-in
(adjective, verb)

adj: In the state of mind where getting the news that your dog was hacksawed to death by a hipster wouldn't bother you one bit. Only obtained by wearing Dr. Scholl's gel shoe insoles. The care-free attitude has been described as relaxing on a hammock made of hemp, while in a coma.
v: being in the above state of mind

Now, here are some words that are more likely to be spoken while gellin'. With these words can come great rap lyrics. And that's sayin' somethin', yo.

bestsellin'
compellin'
dispellin'
dwellin'
Ellen
excellin'
expellin'
felon
fellin'
Ferdinand Magellan
foretellin'
gellin'
Helen
melon
mispellin'
outsellin'
propellin'
rebellin'
repellin'
resellin'
retellin'
sellin'
shellin'
short-sellin'
smellin'
tellin'
yellin'

Rap on, m'brothas.

1)A "gangsta" or "wanksta" way to say 'cool'

2)A way to call a bluff (gansta/wanksta)

A way to call a bluff, to put someone in their place, to make them feel like they don't belong to the "in-group"

Being intoxicated on robotussin cough gels.