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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
 
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