Here's the whole list of rep titles and what minimum rep you need for each one:
User should probably be banned. -9999
User has sunk lower than a packet editor. -100
User broke more items than Ferghus. -10
User the lazy 0+
User has just left the soul stream 10+
User was almost killed by a brown fox 15+
User has defeated the golden spiderling 20+
User the bear slayer at age 10 25+
User the noob elemental master 30+
User the golem slayer 40+
User the succubus slayer 50+
User the ogre slayer 60+
User the bear slayer with a single blow 70+
User the golem slayer with a single blow 80+
User has saved the goddess 90+
User the Mabination seal breaker 100+
User the aspiring sailor 120+
User the explorer of Rano 140+
User the explorer of Connous 160+
User the archeologist 180+
User the explorer of Mabination 200+
User the adult 225+
User is a friend of Nora 250+
User the savior of Erinn 275+
User the dragon knight 300+
User the shadow hero 350+
User the master of posting 400+
User the strong 450+
User the skillful 500+
User the wise 550+
User the all-knowing 600+
User is friends with Cichol 666+
User has slain a prairie dragon 750+
User has tamed a desert dragon 888+
User is a Nation Alchemist 1000+
User is a master of the Mabinogion 1500+
User has transcended Tuatha Dé Danann 2000+
User rep causes parodies: vegeta, what's the rep scouter say? it's over nine-thousaaaaaaaaaaand! 9001+
Of course, as of late, rep really hasn't meant as much as it has in the old days. You can claim that it's jealousy on how I used to be the member with the third highest rep for months, and the closest person to me in rep had at least 300 points less than me, and then all of a sudden, most everyone has a light green bar now. So while originally, it was intended to be used as a way to gauge how helpful a person is (and if derepping was still implemented, how negative the community felt of the person), and even then, it wasn't exactly that useful. Now it's just a thing with some pretty colors that people hand out more than an all you can eat buffet that's being visited by the Klumps, so rep pretty much lost all the little meaning it had originally.