A word used in a sarcastic or mocking tone to deride an individual for foolish behaviors that they have committed or would be known to commit, often accompanied with a hashtag.
Saying that u have a headache as an excuse to not do something, avoid doing something, to get someone to shut the fuck up or to get someone to do something.
Example 1
Man: Honey, we have been together for almost six months and i really wanna express my feelings for you physical..
Woman: Not now! I have a headache!
Example 2
Mother: My son went a party Friday night, he played soccer on Saturday and went to the cinema on Sunday but now he says that his head is hurting him and he cannot go to school tomorroe. What a convenient headache..
A: Dude, you look like you're in agony. What's up?
B: I've got a "Mikegrain headache" man. Worst ever. There's a project due next week and he's freaking out like it was due yesterday.