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1.
One who injests the fumes of the penis vigorously through their nostrils, up until the point where the cock gets vacuumed up into their nose, eventually stabbing the sniffers brain until they die a horrible cock-sniffy death.
Detective: I'm sorry Maam. I appears your daughter was killed in a cock-sniffing accident.

Mother: Whats that? Oh sorry, I was sniffing your cock.
by Cocksniff-Ologist June 24, 2003
 
2.
the worst of the worst insults...nothing can surpass "cock sniffer." this is the type of person that is so gay that not only would they suck a cock, they would take the time to sniff it too. they enjoy their time down in the groin of another man, and will do anything to stay there. few people are this gay, but there are some out there.
as lorenzo finished sucking off roberto, he took a big sniff of robertos cock.
by Urban Dictionary May 20, 2005
 
3.
Someone whose pleasure it is to appreciate the scent of the male genitalia.
I heard that Daniel guy is a cocksniffer
by pnget_69 September 05, 2007
 
4.
A felatious female who enjoys sniffing cocaine or other narcotics off of a man's penis.
1.) "I did a couple rails off the mirror but that bitch was such a cocksniffer and did rails off my cash and prizes.":

2.) Many examples can be found in Monmouth County.
by The Original Kitch November 10, 2005
 
5.
(Adj) A woman so insanely paranoid and jealous of her male partner's interaction with other females that she demands to sniff his genitalia with a view to determining whether he has recently engaged in coitus with a different partner.
Simon's girlfriend demanded that Simon let her sniff his cock because he had been talking to an ex-girlfriend. Simon later informed his colleagues that his girlfriend was a cock sniffer.
by Crazy Pierre May 26, 2010
 
6.
A woman or man that is so jealous they sniff the mans genitals in order to see if he is being faithful
Man... My girl is a cock sniffer, she never believes I'm at work!
by breakr October 21, 2011
 
7.
Someone who is acting like a cock, and would most likely sniff it.

See asshole and/or cock
"Don't talk to me like that you fucking cocksniffer!"
by Mike W January 08, 2005