humorous if you tell someone to take a cold shower, you mean they should do something to stop themselves thinking about sex.
She's clearly not interested, so why don't you just take a cold shower?
take a cold shower
To dampen or suppress sexual urges or feelings by distracting oneself with some kind of activity. Typically used as an imperative. You're losing your mind over this girl. Go take a cold shower before you do something stupid.That movie was steamy! I think I need to go home and take a cold shower.