wrangler

from The Century Dictionary.

• noun One who wrangles or disputes; a debater; especially, an angry or noisy disputant.
• noun A stubborn opponent or adversary.
• noun In Cambridge University, one who has attained the first class in the elementary division of the public examination for honors in pure and mixed mathematics, commonly called the mathematical tripos, those who compose the second rank of honors being designated senior optimes, and those of the third order junior optimes.
• noun Same as horse-wrangler.

from the GNU version of the Collaborative International Dictionary of English.

• noun An angry disputant; one who disputes with heat or peevishness.
• noun One of those who stand in the first rank of honors in the University of Cambridge, England. They are called, according to their rank, senior wrangler, second wrangler, third wrangler, etc. Cf. Optime.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Someone who wrangles or quarrels
• noun A cowboy who takes care of saddle horses
• noun A cowboy who takes care of tourists
• noun An animal handler or trainer
• noun at the University of Cambridge a student who has completed the third year of the mathematical tripos with first-class honours

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who argues noisily or angrily
• noun a cowboy who takes care of the saddle horses