In Mexican culture, a slang term to to refer to the act of placing your mouth into contact with your partner's asshole. It can range from a simple kiss to more intricate making out such a licks, bites, sucks, tongue etc. i.e. a rimjob.
Literally translates to a "black kiss."
Girl 1: I gave Jason a beso negro last night. It was hot.
Girl 2: Oh yeah! I give my girlfriend besos negros all the time.

It is advisable to use a latex barrier when performing a beso negro on someone for the potential transmission of Hepatitis A, unwanted bacteria, and other STIs.
by Kachew November 15, 2009
A rimjob, kissing someone's rear sphincter.
Nada como un beso negro para entrar en calor.

There's nothing like a rimjob in the foreplay.
by jsg July 10, 2004

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