Aah, not to be mistaken for ahh, is commonly used to replaced “very” in internet slang. However, unlike most words used to emphasize adjectives, this is used after the adjective unlike “very” which you would use before the adjective.
aah is an article. It is usually thought of as a more "family friendly" version of "ass", although i think it's more closely related to the suffixes "-esque" and "-ish"
An exclamation of commiseration with unkind connotations, used when something bad happens to someone. Originally coined due to the presence of flowers on the side of the road to mourn a roadside mortality.