Siamese Dick 

When a couple is about to perform anal sex and the man covers his dick in glue and proceeds to ram it into the girl's asshole, thus forming an inseparable siamese twin.

"Dude, you gotta try the siamese dick with your girl tonight! Don't forget to buy the glue!"

Siamese Dick by BiigFrahh July 2, 2014

Siamese Dick 

When you become stuck together during sex. Can happen when using glue instead of lube or naturally.

Bob1: Hey Bob2, why is there a girl standing right in front of you?

Bob2: Oh, we have a siamese dick.

Siamese Dick by MerpyMoo August 30, 2016

Siamese Dick 

When your dick and balls are stuck together so bad from sweat, grime, and fromunda, that they won’t easily separate in order to pee, resulting in a poor stream.

My siamese dick is back today. It’s 90 degrees out and when I went to piss I needed two hands to free it from my sack.

Siamese Dick by Goosey Goose July 22, 2020