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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

halvsies 

Half of something. Giving half of something as in "going halvsies."
The cover charge was $20, and he wasn't earning much money at his job, so I agreed to go halvsies with him.
halvsies by merry3 August 10, 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
A "halvsie" is an unofficial term for a person who is half-Japanese. The term originated in Japan and was coined to replace the more general "hapa."
John: "What is your ethnicity?"
Aiko: "I'm a halvsie, my father is white."
Halvsie by AoUD March 13, 2010

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