A vicious attack that can, if carried out correctly, be fatal. Usually a spontaneous reaction to an insult from a Slevboy. Said to originate from Communist Russia.
Slevboy: Whilst I was attempting to solve a trap for young players I received a Sewell Slap from that guy with the Sewell Cut.
by Mr. Anonymous February 10, 2004

by SeriousCollector August 31, 2013

When someone excretes from ones anus into ones hand and slaps an intended target with the accumulated substance.
by Big RM May 30, 2008

by Anna6457839685 June 1, 2005

by George Gonnella August 6, 2006

by Tyler B February 17, 2005
