From The Collaborative International Dictionary of English v.0.48:
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]