When a man fails to achieve an erection but is undaunted and proceeds to push his penis into the vagina or more commonly anus and attempts sloppy sex by pushing in his penis with his thumb.
Nathan - Aww man im going to jail. imma be some guys bitch. i hope they are tender and start by thumbing it in slack
by SGTKM December 01, 2010
Get the thumbing it in slackmug.