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1.
Puking on someone's genitals because he pushes your head down while you're giving him oral.
It tends to happen when drunk chicks with weak gag reflexes are man handled by guys who don't understand head etiquette.
"Oh man, he wouldn't stop pushing my face down so it was Dirty Jamaica all over again."
by MadMadamMim February 27, 2009
 
2.
When you low weed smoke into a girl's rear end and she farts it back into your lungs with massive force
I wanted a good jenkim high, so i performed the Dirty Jamaica with my grandfater's white-haired bottom cavity
by Paco Vazquez April 21, 2012