A grub. Someone who never brings anything with them to a party (food, beer, etc). A parasite on the party or group of friends who brings them along. Someone who borrows things and never returns them. N.J. slang from Clifton back in the 1980s, still used around this area.
The dude showed up empty handed & he lerped beer from us all night.
No way, we're not bringing him to the party, that guy is such a lerp!
As soon as we lit a cigarette this guy came up and lerped one off of me.
No, that guy can't borrow any of my tools, he's a lerp.
Those lerps stole the keg!