1 definition by HermioneGrangerScrewer

Top Definition
When a man ejaculates on a woman's back and then pisses to wash it off; giving the effect of a Mexican's back after crossing the Rio Grande.
"I could have sworn Hermione Granger was Mexican after I gave her a Wet Back Martinez"
by HermioneGrangerScrewer December 05, 2009

Mug icon
Buy a Wet Back Martinez mug!