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1.
during the process of assfucking a girl, she loses bowel control slightly and a ring of feces comes from her anus and forms a donut around your penis
dude, i was fucking this chick and she fucking dirty donut'ed me. i had to fucking windex my cock cos it stank so bad.
by jeexlabs.com March 26, 2003
 
2.
Sexually, a combination of a dirty sanchez and a jelly donut. First the male will perform a dirty sanchez with the female, then directly transition to perform a jelly donut.
"Last night I was feeling especially naughty and let him give me a dirty donut."
by Ja Ruhl May 06, 2007