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absorbing a cost equally between two people
dude, do you want to go halfsies with me on that killer mud pie?
halfsies by So Mach May 9, 2006

double halfsies

When you can't decide between two things, so you and another person (usually a friend or acquaintance) each purchase one of the desired items and you both exchange half of each item with one another.

Note: Most often done when ordering food. This way you can eat both items you want instead of ordering two meals and looking like a fat ass.
Person 1: "Man, I can't decide between the teriyaki chicken or the club."
Person 2: "Yeah, me neither."
Person 1: "Double halfsies?"
Person 2: "You read my mind."
double halfsies by rkitch February 11, 2013

go halfsies 

to split (especially the cost of something) equally between two parties
I knew she wasn't going to put out, so I made her go halfsies on dinner.
go halfsies by bdb484 December 13, 2010
Most usually (East coast), any person with any type of shine (black) in them.
Hey Gino, that new kid looks awfully tan. You think he is a halfsie? Antnee, you know his moms a shine, he’s a halfsie for sure.
Halfsie by Joe bananas August 18, 2021

halfsies on a pie 

To split the purchasing of a pizza equally among two parties.

Since its inception, the term "halfsies on a" has extended past usage in pizza realted terms and can be used in ordinary conversation pertaining to more typical purchases.

The term's first documented usage was by two white suburban Detroiters during Colombus Day weekend 2004.
"I'm famished, you wanna throw halfsies on a pie?"

"Let's go halsies on a prostie."
halfsies on a pie by Mangelo July 26, 2008
The spelling Halvsie refers to someone who is of mixed halves of races or ethnicity.
usually half Japanese and half caucasian in descent. e.g. 'Devon Aoki is a hot halfsie'
halfsie by pavistroni July 26, 2007