Someone who goes around sniffing
stranger's letterboxes or bodily parts hoping to get a whiff of pheromones and/or sex.
This is often followed by a lewd or suggestive proposition and often results in
violence and/or arrest.
See also crotchsniffer, sexpest and peeping
tom
"What's
wrong with
Jo tonight?"
"She's rampant, sniffing out anything she can."
"
Geez, what a letterbox sniffer"