A bath that is extremely cold and causes the males penis to shrivel up like a turtle. Usually taken for injuries or fevers. Only can happen to a male since they have penises.
I had to take a turtle bath last week to help my fever go down, my junk was practically gone since it was so cold!
A bird bath is when someone walks in on you masturbating, forcing you to quickly stick your member back in your pants as you blow your load, leaving a sticky mess all over your "Bird".
Fuck dude, you made me give myself a bird bath when you walked in on me earlier.
The act of shitting in a urinal
Hey Depo, all the stalls were full so I had to bird bath the urinal.
Washing your penis in the sink.
Kevin: Yeah, I was tryna get a blowjob so I went and took a bird bath.
When you pull out during sex and your cum fills up their belly button.
"She wasn't best impressed when I 'Bird Bathed' her last night."
When your partner, takes a steaming dump on your face, and you smear and wear it like a mask to exfoliate the skin.
"Rachel gave me a himalayan Mud bath last night, now my cheeks are softer than a babys bottom"