An onomatopoeia and is usually a soundheard from frustrated teenagers. This sound is made by pressing your tongue to the roof of your tongue and saying “God”.
an expression used to express extreme pleasure and amazement; often followed with a slew of random characters to emphasize the gloriousness of the cumworthy event
GAH is an acronym, usually used by young adults of the Millennial generation, pertaining to the saying "Gay As Hell."
It is usually used to describe a situation or person that is annoying, boring, or useless.
"Man, this English lecture is GAH."
"Jon looks GAH in that too tightpolo."