FU Button 

It's the call answer setting or the button you press/swype on your cell phone to have a call go directly to voicemail.

Oh God, it's James again. I'm really not in the mood to have another narcissistic, one sided conversation with him today. I know, I'll just hit the FU Button so his call will go directly to my voice mail.

FU Button by sHellzBellz1 March 3, 2012

f-u button 

when someone calls you and you don't want to talk, you press the ignore button on your phone

Person 1: I don't feel like talking to him right now
Person 2: Just give them the f-u button

f-u button by dea8196 February 8, 2009