Meaning: very smart in brain power, or looking very good, or a very strong flavour or a very harsh thing to say
Example: The smartest boy in the class was very sharp and he like to eat sharp cheese. He also is very sharp with people that aren't as smart as he is.
See this Idiom in a story: Valentine's Day Song: I Can't Give You Anything But Love, Valentine's Day Can be Tough Without Lettuce