by pavistroni July 26, 2007
 Get the halfsiemug.
Get the halfsiemug. a partially erect penis that occurs typically when the owner is aroused by something they should probably not be aroused by or in other inopportune situations.
Armando is inappropriately and uncontrollably partially aroused by his room mate. He now has a halfsie.
by hardguy January 9, 2010
 Get the halfsiemug.
Get the halfsiemug. Person # 1: Hey! Where are you from?
Person # 2: I'm half British and half Indian
Person # 1: Oh so you're a halfsie? That's cool!
buy halfsie mugs & shirts
Person # 2: I'm half British and half Indian
Person # 1: Oh so you're a halfsie? That's cool!
buy halfsie mugs & shirts
by kurryma August 26, 2013
 Get the halfsiemug.
Get the halfsiemug. by Curly Dino July 7, 2006
 Get the halfsiemug.
Get the halfsiemug. by So Mach May 9, 2006
 Get the halfsiesmug.
Get the halfsiesmug. 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.
by Joe bananas  August 18, 2021
 Get the Halfsiemug.
Get the Halfsiemug. Why would you go halfsies with that halloween costume and just wear a hat? You should go all the way and wear the whole outfit.
Want to go halfsies with me and split the cost of dinner?
Want to go halfsies with me and split the cost of dinner?
by cirrus42 January 25, 2012
 Get the halfsiesmug.
Get the halfsiesmug.