Meaning of the word stiffy in English

What does stiffy mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

stiffy

US /ˈstɪf.i/
UK /ˈstɪf.i/

Noun

an erection of the penis

Example:
He woke up with a morning stiffy.
He tried to hide his stiffy under the table.