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1. semi-boner
When ones penis is no longer erect, possibly either after blowing ones load, or just losing an erection. A semi-boner is often used for playfully slapping ones friends in the face while they sleep for a hilariously good time.
To try and piss my friend off, I got a semi-boner and helicoptered it around in his face.
2. semi boner
When your erection is only semi, it does not go all the way. This is actually more embaressing than a true boner because people think you 'cannot get it up'
HAHHAHAHA LOOK PHIL HAS A SEMI BONER OVER CHARLOTTE!
ITS PROBABLY OVER JOHNNY CAUSE ONLY HOMOS GET SEMI BONERS!
3. Twizzler Syndrome
When a guy's cock is semi-hard but won't stay up, like a twizzler. A twizzler is hard and biting into it, they are very chewy; however, they won't stay straight up when held out, they slowly fall over.
Girl 1: Did you and Jared finally hook up?
Girl 2: Yeah but he could only get a semi. He had twizzler syndrome.
4. semi jimmy
semi erect penis, not rock hard but not flaccid

i usually wake up in the morning with a semi jimmy
5. semi
the in-between state of a limp dick and a usable hard-on. can be on the way to hard, on the way back from hard, or never allowed to get more than 60% (+/-) hard.
many a young man learn to hide their semi with text books after day-dreaming in class
6. semi erect penis
The point where ur penis is kinda hard and ur excited but still have ur pants on. You might be dancing with some fine slut and she'll feel a little bump comin through and grind that shit like she's fuckin got an itch.
Guy 1: Shit man, i got a semi erect penis when i was dancing with her.
Guy 2: Did she grind that shit like there was no tomorrow?
Guy 1: Nah she only likes nello and his big bulge.
7. half a hard on
1) self explanatory- a half hard penis. 2)a dummy, a half wit, can't think clearly
1)I got so drunk I couldn't play "hot dogs and doughnuts"with my girl with a half a hard on. 2)that half a hard on is still paying into social security.
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