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1.
The act of ignoring a call on a cell phone by pressing the side button to silence the ringer.
Alex called, and I didn't feel like talking, so i decided to side-button him
by Deepy April 14, 2006
 
2.
To ignore someone. Refering to the side button of a cell phone.
oh, that was just my ex. I side buttoned her.
by Postal1134 May 12, 2006
 
3.
v. To snub someone via cell phone by pushing the IGNORE button rather than answering the call.
"Nah, it was just my ex. I side-buttoned him."
by HeyKaren December 08, 2005