Someone who leaves their work to the last minute but to the surprise of others somehow miraculously gets top marks.
Bob: I've got about 8,500 words left to write for my dissertation
Guss: So you've only done 1,500? Dude that's due in on Monday! Everyone I know has done it!
Bob: Yeah. I always leave things to the last minute. I'm a leaver
Guss: You're crazy.
Guss: So how did you do
Bob: I got a high first
Guss: I hate you.