Riding A Semi

What is Riding A Semi?

To have a half erect penis.

Riding a semi is often used in public to tell someone without revealing it to everyone.

Dude, I'm riding a semi right now.

So at the party I was grinding on this chick, but I started to ride a semi and had to get out of there quick.

See half boner, half chub, boner, halfsie, erection, Stoan

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Riding A Semi Edit Meaning