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The act of sharing, splitting, or taking part of any event or object with another person. Usually phrased in the verb tense or going to engage in such act.
Person1: (holding a piece of cake) "This chocolate cake looks delicious!"
Person2: "Hey, i want some!"
Person1: "Ok, lets go Halfies!"

Person3: I have so much work to do, i wont be able to finish it all.
Person4: Don't worry about it, we'll go Halfies and finish the work on time.
Person3: Thanks!
Halfies by Elprezzi November 27, 2011
When you only smoke half of your usual amount and then smoke a little more later on after you've come down to prevent getting too high
"You wanna smoke halfies now so we can smoke again later?"
Halfies by lil danks January 29, 2018
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

halfmiester 

Bestfriend that is a halfa, (half-virgin), with you. Not your girlfriend, boyfriend, spouse.
Sierra is my halfmiester.
halfmiester by Halffster August 10, 2009