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2.
When a person is chewing the inside of their face off, due to being under the influence of a pingar.
"Dude you have a side mouth"

"Man have you got gum, im chewing the inside of my mouth off"
by GEZZYKARRR August 09, 2008
 
1.
when someone talks through one side of their mouth
people who talk with side mouths: gerard way, pete wentz and cory monteith. MMM ITS SO HOT
by sidemouthsaresexy February 08, 2011