Semi-Hard 

When a penis isn't hard, but isn't flaccid, it's semi-hard. This is also used in the title of a Cleveland Show Christmas special, "Die Semi-Hard".

"Dude last night I tried to FHRITP but I was only semi-hard.."

Semi-Hard by Auditioning my Finger Puppets February 17, 2020

Semi-hard teeth 

When a blow job requires teeth that aren't too soft or too hard but just right, the blow job giver removes their real teeth replacing them with confectionery teeth that become semi-hard as the blow job progresses.

Guy 1: Hey that blow job felt great
Guy 2: Probably because of my new semi-hard teeth.
Guy 3: I want to go next.. takes a hammer out and 2 confectionery teeth from a candy bag.. grins
Guy 4: laughs!!!... we don't need a hammer.. slides a teeth buster over his cock and face fucks Guy 3 breaking out all his teeth, before stuffing the confectionery teeth into their bleeding gums.

Semi-hard teeth by Jax Cavalera January 17, 2019