Sometimes Japanese is Surprisly Descriptive （あほげ）

He Says:
ahoge　（あほげ）=stray hair
If you have a stray hair, you can say "ahoge hakken!"(I discovered a stray hair!)
Your japanese friends will burst into laughing you used the dirty & funny word.

She Says:
Not so dirty, I suppose, but definitely funny and a way to expand your use of the word "aho". I'm pretty sure that this word is actually a better word in Japanese than it is in English. "Aho" is "fool" and "ge" is "hair, so that makes this literally "foolish hair".
Men especially can use this word if they've missed a spot shaving.

The next word is...かす。