Portmanteau of the words phone and boner.
The distinct bulge that occurs when one wears pants that are too tight, and attempts to store their phone in the pocket of said jeans. Resembles the bulge generated by an erect or semi-erect penis.
"Did you see the phoner Hilary was rocking this afternoon? She looked like Ron Jeremy in emo jeans. "
A Phoner is a mistaken boner in your friends pants, which is actually a cell phone that has fallen too far into a front pants pocket( Right or Left) of your friend.
" Dude? are you poppin' a stiffy HERE?"
" Dude, relax, its just a phoner"
Cindy: Your phone, it's been ringing for a good 2 minutes....
Nigel: Oh, WOULD YOU LOOK AT THAT you're RIGHT! I TOTALLY wasn't even paying attention.
Cindy: Were you getting another one of those BLOODY Phoner's! Nigel I told you to keep your God Damn phone in your jacket pocket I can't believe your getting ONE-On at the dinner table with my parents right beside you.