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1.
When a woman covers your nose with her vagina, and puts her butt hole to your mouth. She then lets out a nasty fart, thus filling your lungs with dirty air. This was originated by a girl name Jenny, thus the name.
I got the nastiest dirty Jenny last night, I had to pick the chunks out of my teeth.
by Deisel23 June 29, 2011
 
2.
A nasty roach; the harsh end of an almost completely smoked joint or marijuana cigarette
Gimme a toke of that dirty jenny
by yytwizzard July 30, 2011