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This is a horses equivalent of a orgasm. In some hick towns in America where sleeping with animals is accepted, boasting in the bar about giving your horse a "Maregasm" is quite common and completely acceptable.
Cletis: I gone and got me a new horse called Betsie, She's a beauty, it took me a while but i gave her a "Maregasm" she aint never gonna forget!
John Boy: Way ta go Cletis, you a lucky man!
by Paul Fleming July 14, 2006
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
The best gift you can give your marefriend. It is when your marefriend backs up into you and you cause her to climax
I celebrated my 2 year anniversary with my marefriend by grooming her, feeding her apples and eating out her sweet hay vagina until she had a maregasm
by marefriend May 03, 2015
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