n. A person who is typically/always socially imperceptive and 'latches on' to a group of people. this person is along for a ride and is impossible to lose, usually makes awkward comments making them unwanted. they are with you and eat away at your cool factor, making them a parasite
n. a tape worm with many friends and/or a facebook account
guy: wow person 3 is such a parasite!
girl: i know he saw us at dinner and has not left yet...wtf
person 3(social parasite):so guys....im going to watch you make out ok?