When a person of the same sex sneaks up behind another person and then loudly sniffs the person, perferable from the base of the shirtline to the earlobe. Used to create that creepy guy on guy atmosphere within your workspace, great for new guys.
while Guy 1 is talking to his buddy guy 2 slinks behind and gives him a prison sniff.
Guy 2: *SNIFF!*
Guy 1:WTF! MAN! did you prison sniff me?!
Guy 2:And you smell Delicious