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1) The headache you get after watching a Michael Bay movie.

2) The result of hearing nothing but explosions for two hours straight.
After seeing Transformers: Revenge of the Fallen, I had to take three Advils to relieve the massive Bayache I had.
Bayache by Pantsarama June 25, 2009
Related Words

BootyAches 

Headaches for your butt.

Can only be cured by penetration.
John: My wife really had some bootyaches last night. I had to give her a good dicking to calm her down.
BootyAches by VocabGod9000 July 20, 2018