It is not "No Homo" nor is it "Completely Homo." It is when a sexual act occurs between two people of the same gender that will not leave the relationship between the two people feeling awkward or strained because of the act, but is too gay to ever be mentioned to anyone besides themselves.
Mark: "Dude, Steve. I think we made out last night."

Steve: "No Homo!"

Mark: "Too late for that dude. Let's just not tell our friends. Half Homo! Whew, if I hadn't called that we'd be really gay right now bro."
by BjornikovTheMighty August 26, 2010
Get the Half Homo mug.
The act of being attracted to the same sex and the opposite.
Erica: Did we make out last night?
Marissa: Yes. But we were drunk totally "no homo".
Erica: Actually we are half-homo.
by halfhomogirl July 18, 2012
Get the half-homo mug.
A bisexual male.
Often used in defence by the bisexual.
He uses it to fend off the fully gay boys because he doesn't "go the whole way" with boys.

"Hey fag boy come over here and give me some of that sweet ass"
"I'm not a fag. I'm only a half homo. You're not getting any of my sweet ass buddy."
by MINGA June 29, 2006
Get the half homo mug.
"Half Homo" is a derogatory term used to describe a straight man who exclusively engages in anal sex with women. A man who is half homo does NOT engage in any homosexual acts with men, however he does forsake vaginal intercourse and is only satisfied by sodomizing women.
Katie: Lets have a quickie!
Jacob: Ok, but only if I get to pound that ass.
Katie: Why don't we ever have normal sex? Are you Half Homo?
by Lonely Roamer March 14, 2011
Get the half homo mug.
A guys who checks out other guys, is a half a homo.
by jaystar March 11, 2003
Get the half a homo mug.