Gassin' 

1. A fast rapping rapper spitting all facts.

That new rapper Young Brayzen be gassin' in the booth!

Gassin' by Brayzen1800 June 12, 2019

Gassin 

jokin, or lyin

That Boy aint rich hes gassin you

Gassin by bakersman February 27, 2004

gassin 

Gassin means lying, possibly joking.
It has replaced the previous word air.

Why you gassin, you never boned her!

gassin by Tili_____1 September 24, 2009

Gassin 

1. when someone is spittin fire, dope raps.

2. when you firing a weapon, usually an automatic weapon or a choppa

These are Bay Area definitions

You hear dat track by DB Tha General dat boy was gassin on dat bitch.

When I see dem niggas, ima start gassin fuck these niggas. All dem niggas finna get knocked down.

Gassin by GAS NATION January 13, 2010

gassin 

this mean some 1 is chatin shit

i aint got no money

*stop gassin*

gassin by B!GZ M@N & BLITZ KIZZLE August 25, 2006

gassin 

where a group of people cheer on a certain person

the teachers were gassin the talent show

gassin by princessangelz March 27, 2020

Gassin 

Gassin is another way of telling someone their lying, bullshit

For example 'I only had Wine, whiskey and weed' 'oi Libby why u gassin'

Gassin by gassmaster December 30, 2016