1/4 inch sneak 

When bangin' the bejesus outta your girl you in one swift motion pull out and plung it in her arse. Also know as the ALLIOOP or COMING IN UNDER THE RADAR.

You should have heard her moan after I gave her the old 1/4 inch sneak.

1/4 inch sneak by J.F. February 12, 2003

1/4 inch sneak 

while banging away at your girl pull it out and shove it in her ass with no warning

changing lanes without signaling

1/4 inch sneak by will simmons June 15, 2004