stands for "fake sleep", it is something you usualy do to fuck with and annoy someone, or to get them to leave you alone. can be done anytime and anywhere.
by shane941 March 27, 2007
Get the FSmug. by gayfortacos November 14, 2016
Get the fsmug. by Bootybootybootymarijuana April 11, 2017
Get the Fsmug. by yagirldictionary October 23, 2016
Get the Fsmug. Fucks Sake. Colloqiual (usually Eastern Scottish) internet acronym. Almost identical to wordffs/word but lazier.
by wadie May 15, 2003
Get the fsmug. 
