The term used when you call someone and they hit the ignore button on their cell phone, to avoid speaking with you.

The term originates with Nextels because they have a side button to do that.

You know you've been side buttoned if it rings for a shorter time than usual before going to voicemail.
Mark: Oh no! Greg is calling
Jessica: Don't answer it!
Mark: Good idea, I'll side button him.

Greg: What the fuck, TWO rings? Fuck Mark for side buttoning me.
by Li Hibbs August 22, 2005
The action of ignoring an incoming call by the use of the side button on one's cellular phone.
"Dude, I totally side buttoned this chick last night. She must have called me five times."

by Taylor H. March 2, 2008
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
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 8, 2005
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