1) An egg-based stable liquid-mixture commonly spread on sandwiches and used as salad dressing or a binding agent in cooking.

2) Semen.

3) Boring, whiter than white. Used by Caucasians to refer to other Caucasians who shun their ethnic heritage in favor of a more yuppie lifestyle. Originally used by Italian Americans from the Mid-Atlantic states, it has gained more use due to its reference in the popular HBO show, The Sopranos.
1) "Can I have mayonnaise on my sandwich instead of mustard?"

2) "That asshole jacked off while I was out last night and got his nasty mayonnaise all over my favorite sheets."

3) "Ever since Angelo started dating that girl, he's become so mayonnaise. All he talks about now is joining a country club and buying a house in the suburbs. What gives?"
by Mint Z November 2, 2008
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It has many humurous meanings.
-- Semen
-- Black Mans Kryptonite
-- Stuff that goes on your ham sandwich
-- What white boys think is cool.
-- Yo man, i covered that hoe in mayonnaise.
-- Yo foo', i cant eat that whack mayonnaise shit.
-- Check out the white liquid on that there ham suckaz.
-- Hey man, check out my hardcore mayonnaise.
by Mayonnaise Tastes Like Purple November 29, 2004
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Something or someone who is plain and boring. Sometimes used to describe caucasian people or heterosexual people.

See also: vanilla
Sara is such a mayonnaise name.”
by Healing Smile January 1, 2019
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Compound word of half man, half amazing.

Word created by LeeAnna and Matthew.
A hybrid man who is infused with incredibly high levels of amazing. Often confused with an being from another planet.

" Where's his spaceship, he's so mayonnaiseing he can't be from this planet."

Bawk bawk.
by pamyoumanatee! August 6, 2011
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Mayonnaise.. usually white and put on a sandwich. Or other foods. IT also has a redneck definition..
Mayonnaise a lot of people here tonight....
by Grumpy Granny December 20, 2016
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When Brandon Buckingham squirts a whole jar of mayonnaise into Danny Mullen's face for being a narcissistic asshole.
I mayonnaised him so hard. The aftermath looked like he got jizzed on by 100 gay men.
by GaryWinthorpe22 April 9, 2021
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