From The Collaborative International Dictionary of English v.0.48 [gcide]:
hooter \hoot"er\ n.
1. the nose. [slang]
Syn: beak, honker, nozzle, snoot, snout, schnozzle.
[WordNet 1.5]
2. An automobile horn. [Brit. slang]
[PJC]
3. A woman's breast, especially one that is large. [vulgar
slang]
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
hooter
n 1: informal terms for the nose [syn: beak, honker,
hooter, nozzle, snoot, snout, schnozzle,
schnoz]
2: a device on an automobile for making a warning noise [syn:
automobile horn, car horn, motor horn, horn,
hooter]
3: nocturnal bird of prey with hawk-like beak and claws and
large head with front-facing eyes [syn: owl, {bird of
Minerva}, bird of night, hooter]