Describing someone who either is, looks, or does something fucking retarded beyond measure. Retarded people, weirdos, annoying fat kids, drunk drivers, slutty girls who regret what they do afterwards, creepers. Just straight dumbass status.
1.) Haha, you failed the test you larc!
2.) Yo get out, your larcking up the party.
3.) Did you just honestly eat out the trash you larc?
4.) Damn, your such a larc.
5.) I saw you trip you LAB(larc ass bitch)!