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.