When a males penis is neither erect nor flaccid, but usually somewhere in the middle. This usually happens without a male being aware of it, or if his penis is slightly aroused. This can result in embarrassment or satisfaction depending where this occurs, and the occasion.
Example 1:

John: "I love the amazement in the other kid's eyes when they see my junk in the change room. They think i have genes from the black mamba when really i just have a halfie!"

Sam: "What is a halfie?"

John: "It's when i arouse my penis just a tad so that it looks like my penis is bigger."

Sam: "You really fooled me, i thought you where born that way!"
by azifromcalgary October 4, 2011
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Halfie, is when you take a selfie, but only of half your face, or body. It can be either half your face, (upper, lower, only one side) or half your body (upper, lower, or the sides)

The halfie phenomenon is a Norwegian word, invented by a globetrotting guy from the west coast, on his travels to Paris, he discovered a way more interesting way to take pictures of himself in his endless quest for likes on various social media sites. Halfie is now taking the world by storm starting with Norway and Paris, and quickly spreading to the United States.
He took a nice looking halfie.

Selfies are so 2013, it's all about them halfies now a days.

She took a halfie in the mirror today, and it was fabulous
by Twister_r0 February 26, 2014
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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!
by Elprezzi November 28, 2011
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When one of your friends is just being dumber than a box of rocks. Or just simply sucks at video games
Bro 1 “Hey man, Bryce is acting like such a halfy right now” Bro 2 “I know dude, he can barely form together a sentence”
by Bryce-is-a-halfy February 13, 2022
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A halfy is when a person gets as close to a complete orgasm as he/she can, and then gets distracted and/or turned off by his/her partner or something else, therefore losing the orgasm completely and is unable to regain it. The person has had "half" an orgasm, or a "halfy".
An example of a Halfy would be if a woman is climaxing and her boyfriend cums to soon,it could distracther from her own orgasm, even though it has already started, and she will lose it completely. She will only have felt the beginning of an orgasm and will be unsatisfied.
by Yummykitty82 February 18, 2009
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A half ounce of marijuana 14 Grams.
Take that pound and break it into halfies and we alright.
by Jewish Drunkard January 18, 2006
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"Dude, my boy is sellin me this halfy for the super low low."
by TtJUST Ryan June 30, 2009
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