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1.
An exclamation of the pain one's sides are experiencing as a result of laughing so hard.
"Justin Bieber is the best singer ever"
"HAHAHAHA MY SIDES"
by Swag McSwaggerson October 23, 2012
 
2.
Used to get someones attention
"Oi my side!"
"Oi girl im talking to you!"
by A lollerskater December 21, 2006