The sexual act when a couple, laying the 69 position, stick their toes into the other's anus, covering the said appendage in the excrement of the other. Then, the partners flip positions and suck eachother's toes clean of the smelly brown (or occassionaly discolored green) substance. Prefered by the nasty and demented.
Last night Amber and I performed the "Dirty Toe" and her breath still reeks of my poo.
when one sexual partner inserts his or her toe into the anus of the other followed by the person sucking it clean
she tried to kiss me but her breath was nasty after I gave her a dirty toe