When you go to use the toilet in the middle of the night and your man leaves the toilet seat up, you sit down and fall into the toilet thus baptising your butthole with toilet water.
Last night I got a "Baptised Butthole" when I woke up at 3am to pee and of course the husband left the toilet seat up, I was so sleepy I didn't double check before I sat down and my ass fell in the toilet.
When you stick a joint in your mouth an wet it with your saliva to tighten it or keep it stuck together. It also makes it burn slower, if your using fast burning papers. Done before lighting it.
Pulling out and blowing your load all over a female's ass after having sex in the doggystle position.
Suppose you see a fine woman walk by with a nice ass, you can say, " Damn baby girl, I wanna baptise that ass" or "Hey baby, why don't you come back to my crib and I'll baptise that ass".
To baptise, or to perform a baptism, is to rub one's milk-laden breasts across a gentleman's/lady's head and/or face, expressing an indiscriminate amount of boob juice on to the subject's forehead.
Although I'm 8 months pregnant I still managed to baptise several gentlemen and one lucky lady last night. Alas, my jugs will soon be empty.