To suck out semen from an ass, or less commonly from a twat. Also known as the 'mud milkshake', and the 'sludge slider'
'Jeremy was so horny last night, he begged me to give him a sludge slider while going the reach-around'
by Kung Fool June 20, 2005
 Get the felchmug.
Get the felchmug. by ryan November 25, 2002
 Get the felchmug.
Get the felchmug. by Josef Salmon March 13, 2005
 Get the Felchingmug.
Get the Felchingmug. by Kyan January 7, 2004
 Get the felchmug.
Get the felchmug. v.t., (from the Welsh: honor; dignity)to suck your own semen out of another man's rectum (preferably with a straw).
Having corn-holed Tom Jones with abandon, I fetched a flexi-straw and felched Tommy Boy 'till he was dry.
by Ronald Hall January 10, 2003
 Get the felchmug.
Get the felchmug. by jaydon33 March 18, 2005
 Get the felchmug.
Get the felchmug. by Megaman09 April 29, 2009
 Get the Felchmug.
Get the Felchmug.