The act of defecating onto another person, and wiping the faeces into a smooth surface across their body. At this point, it is popular to add "double yellow lines" of urine, or "white lines" of semen.
"Afsana enjoys tarmaccing with a horse"

"After the picnic, the children went back to the cottage for some tarmaccing"
by Andrew Cole May 16, 2007
The act of involuntarily defecating in one's sleep, and rolling over the fresh produce until it is thinly and evenly spread over the mattress. Normally happens after a Guinness/curry combo.
Adam won't have more than three pints of Guinness on a curry night for fear of tarmaccing.
by Azazel666 May 15, 2010

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