A Necessary Fuck. One that is required either arising out of circumstances beyond the control of the participants or due to an extreme sexual attraction that can only be settled with a good toss in the sack.
Etymology>>> Sex ( the act of penetration) + essary (required or obligatd)
Any unnecessary, gaudy, flashy, or otherwise ridiculous looking accessory added to cars, houses, or their chihuahua. Do not necessarily have to be a mexican to mexcessorize.
Jesus: A esé, i need some eh sprite! i just installed my erector set wing on my 92 civic!
Jaun: Dammmmnnn fooo thats ballin!
Jesus: just waiting for my 12" hubcap spinners to come in the mail now holmmmess.
*whiteboys driving by in chevy*
Jake: Hey look at my gardeners civic, that shits SIICCCCKK (end sarcasm)
Jeff: Nah, he just added some mexcessorys to it.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"