The sound your penis makes when you slap it across the face of a girl from left to right and then right to left.
In the heat of the moment while she was bent in front of me, I grabbed my penis and gave her the wip wap of her life
by CrossRaven February 13, 2007
To go back and forth in a strange way.
That tornado went wip-wap.
by Squlrrel September 12, 2015