Tarmacked is were a male and female take part in sexual intercourse and were the female is on top and sits on the males chest and shits on his chest and rubs up and down it.
"Oh god last night i got totally tarmacked. I was with this really hot chick and she was on top, the she sat on my chest and did a shit on it and starting rubbing up and down."
by Shut-It September 03, 2009