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1.
Quite often is mistakened for phone "sex" but in actuality, it is just simply conversing on the telephone. However, it is more appropiately used with the opposite sex. boyfriend/girlfriend type of deal, or vice versa.
"Me and my girl were phone banging until midnight before she got sleepy and went to bed."
by mj23_cloud98 October 20, 2003
 
2.
A guy who is on the phone for a long period of time, usually with a girl...so it is assumed that he is phonebanging.
"hey, where'd he go? i haven't seen him for hours but his ride's still outside..."

"oh, he's in the room phonebanging."
by LORNA VU July 08, 2006