The act of index finger insertion into one's anus with the mission of prostate stimulation.  The purpose of prostate stimulation is increased semen discharge distance.
by Danger, ShallenVag, the D, Hamil$tein October 20, 2005
 Get the tickling the walnutmug.
Get the tickling the walnutmug. by nigga obie June 12, 2011
 Get the walnut herpsmug.
Get the walnut herpsmug. Dude, this camping trip has lasted so long that my shit has clumped into black walnuts around my asshole.
by Trombone77 July 30, 2021
 Get the black walnutmug.
Get the black walnutmug. by anudimog1 June 19, 2010
 Get the Walnut Facemug.
Get the Walnut Facemug. by Sam.spec January 20, 2018
 Get the cracked walnutmug.
Get the cracked walnutmug. by Inhumaneolive July 23, 2016
 Get the Inbred walnutmug.
Get the Inbred walnutmug. by  red snapper June 19, 2008
 Get the walnut meatmug.
Get the walnut meatmug.