Guelo, pronounced Way-lo, is Spanish slang for grampa, grandpa, grandfather. It is a term of endearment, used among friends when one is a generation or more senior in age. It is an abbreviation of the word Abuelo.
Hey Guelo, sit here in the shade. Let the young bucks swing that sledge for a while.
by jimmy da prick September 17, 2016
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a catch-all word for any noun or verb, often used in order to encourage the question of "what is guelo?' in response one must respond "one does not simply guelo into Mordor.
My mellow, fellow, guelo, once inquired if one could simply guelo, mellowly, with a fellow, into mordor. To which I replied emphatically, one does not simply guelo into Mordor.
by GAMSbond March 6, 2011
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The Legend of Puto San Guelo:

Puto San Guelo is a demon who visits teenaged boys and men in the middle of the night, on the first new moon in the Spring, and tries to suck thier penis. According to the legend, if Puto San Guelo sucks your penis, you will become impotent (or your penis will shrink, or you will become gay -- there are several variations).

To protect yourself from Puto San Guelo, you need to cover your genitals in some way on that night, such as with a suitably sized cup or athletic supporter ("ball cup").
When I was younger, my Latino freinds used to tell me of the Legend of Puto San Guelo. Some would actually wear athletic supporters to bed on that night.
by Pseudo Wisdom May 7, 2013
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