\ˈbəmˈshə-fəl\ (noun) - the exaggerated way a panhandler will walk at intersections in order to get more money from motorists through sympathy or amusement.
Sniffing something with one's anus. Place the anus over somebodys face and clench the muscles of the bottom,, the opposite of a fart, thus bumsniffing.
Michael always wanted to bumsniff Merlo, so when the chance came, he bumsniffed him then he had a tashwank to celebrate.
(n) The act of penetrating one's pooper with an object of a phallic nature (e.g. fingers, cucumbers, johnsons) for the purposes of sexual gratification, regardless of the gender or sexual orientation of the participant(s).
I was going to go the picture showlast night until Bertha suggested we go back to her trailer for a spirited bout of bumstuffing.
If you are really promising yourself not to swear/curse; the word Bumsniffer comes out of your mouth.
Also, if you have noticed sniffing bums really isn't pleasent. So People will also take it in as a hurtful response. Just like fuckyou, or bitchplease. IT's all the same. Bumsniffe is just the nicest form to put it in :)
You can also say it randomly. Try it, It's fun.
"YOU FU..BUMSNIFFER!"
Person 1 : "Hey ______, you look like a douche today"
Person 2 : "Shut up Bumsniffer"