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1.
Generally, used to describe several different things as follows:

1. A person's own excellent physical/mental state.

2. The outstanding physical appearance of another person.

3. A state of being extremely thin

(Since frogs do not have hair, something that is "finer than frog hair" means something that is as thin/fine/excellent as possible).
1. Bill: "How are you doing today?"

Joe: "Man, I'm finer than frog hair!!"

2. Bill: "Wow, have you seen that new girl in accounting?"

Joe: "Yes...what a hottie, she is finer than frog hair!!"

3. Bill: "This new fishing line is the thinnest I've ever seen"

Joe: "I agree, it is finer than frog hair"
by the big tiger January 17, 2011
54 19
 
2.
When you feel so fine you just can't stand it. Frog hair doesn't exist, so, it must be pretty fine!
Rob:Susan how are you today?
Susan: Well Rob Id say Im finer than frog hair!

Rob: Whats what on a frog?

Susan: You ever seen hair on a frog?
Rob: Welp nope can't say I have...
Susan: Must be pretty FINE THEN!

All: Hahahahaaa.. ha.
by Wank Eubanks November 19, 2012
4 0