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1.
An anagram for the word "nigga".
"What's up gagin?"
"Gagin What?"
"That shit was gagin rigged, yo."
"Sup my gagins"
"Gagin stole my bike."
by Gagin Kent September 04, 2006
 
2.
Regional slang of Central Illinois.

When something is so funny that one loses the ability to breath.
" I was gagin' last night when Obama punched Mit Romney in the balls!"

"that's a gag"
by E $$$$$$$$$$ January 14, 2012