The act of getting pooped on, for sexual arousal and pleasure.
Hey honey! Can I have a mud bath today?
To shit in a bowl of hot water, then use the mixture to take a sponge bath.
Steve: Why do you smell so bad man?
Al: I took a nice hot Mud Bath this morning.
The act of having a someone pour 2% milk into their mouth, adding a teaspoon of nesquik, and then proceeding to slowly dip your genitals into their full mouth.
Ally was craving chocolate milk and I was horny so we met in the middle and she agreed to an Ohio Bird Bath.
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."