Smells like boy mouse 

Refers to a male's bedroom or a room inhabited by males. Testosterone, sweat, farts, and cum have given the room that dank scent reminiscent of the cage your stinking male mouse lives in.

Last night Jim was hanging with his boys playing Smash Bros til 4am then they put on some porn and had a circlejerk. Now it smells like boy mouse in here.

Smells like boy mouse by Human Pickled Punk May 15, 2016

Cock like a mouse's ear 

A particularly small penis

That's the last time I date a body-builder! All those big muscles but a cock like a mouse's ear!

Cock like a mouse's ear by Sally Nips September 27, 2009

Quiet like a mouse underneath a scab 

A famous Slovakian saying. It means, 'to be very quiet'

When a housband comes home drunk, the wife cannot say anything. She has to be quiet like a mouse underneath a scab, or there would be a problem.

Quiet like a mouse underneath a scab by EldoradoAvocado August 22, 2023

hung like a field mouse

(adj.)

A term in which your dick appears to be very small.

"How was the date?"
"Heh, it was good, he's a nice guy"
"Didja suck his dick"
"Y'know... I tried but I couldn't find it; he's seriously hung like a field mouse down there."

hung like a field mouse by Rainifer December 18, 2008