http://www.merriam-webster.com/dictionary/huh

Quote
huh interjection \a grunt articulated as a syllabic m or n with a voiceless onset, or as the syllable ˈhə or ˈhəⁿ, often ending in a glottal stop, and uttered with a range of intonations; often read as ˈhə\
-used at the end of a statement to ask whether someone agrees with you

-used when you have not heard or understood something that was said

-used to show surprise, disbelief, or disapproval

Full Definition of HUH

-used to express surprise, disbelief, or confusion, or as an inquiry inviting affirmative reply
See huh defined for English-language learners �
smirk

Jim
Formerly from somewhere on a beach in Belize