When your partner is laying down, face up, straddle his/her chest, and while receiving oral from your partner, shit on his/her chest, giving that bushy, hairy chest look, just like Thomas Magnum, from Magnum P.I.
Honey, my chest was a little moist and warm last night when you gave me the Thomas Magnum treatment.
by MochaDiet August 3, 2012
Get the Thomas Magnummug.