1: Fucking someone who you really dislike but would like to punish through sexual intercourse (often a celebrity and often in an aggressive manner).
2: Fucking someone to get back at someone else (usually someone related through blood, friendship, work or sexual relations).
Grudge fuck example 1:
Grudge fuck example 2:
Your ex-girlfriend’s really hot sister
Your boss’ husband
Short for maggot. Australian slang for very drunk. Can also be used as maggos.
Kevin: Man, I got lost walkin home last night. I was fucken maggo.
Gavin: Bro, I was so maggos I puked on my own face.