Define Grahhhh Meaning

Example A:
Aiden: "Oh man. We've got that exam today don't we?"
Jaimie: "Yeah...I didn't study."
Aiden: "Grahhhh...this sucks!"

Example B:
togetha4eva: "I'm bored."
smack_yo_btch_up: "Me too."
togetha2eva: "Grahhhh."