Gach: Can be noun, adjective, or verb.
People are too PC about using gay as an offensive word so gach replaces it in sentences where you feel like it needs to come up.
Also used to describe bullshit that you experience on a day-to-day basis.
Synonyms: malarkey, balderdash, claptrap, chopped, fucked up

when you're hungover as shit after a spending a night drunk as a skunk

See gech for formal definition.
Also used as a salutation.

Origin : Word is of gaelic origin and pronounciation may vary by region.

a person who is being stupid

Hottest fucking bitch ever. Her 500 pound leg is so hot and greasy. I just wanna cream myself.

Gach is similar to getting fucked over, such as when something bad just happens or doesn't go the way you want. A mosquito gaches you when it bites you. When you fail an exam by one point you got gached. When your girlfriend was supposed to come visit you, but her mom gaches you by telling her she can't.

(Gay chach). Someone who is too much of a chach to be called one.