When you have anal sex really hardcore.
So hardcore your partner walks funny for several hours or potentially even into the next day.
This is is not to be confused with a similar word Bukkake
- the sound of this word ← is "boo-cock-kay" and means to jizz on your partners face (usually with lots of people) or a lot of times.
I fucked that bitch so hard I gave her a Buck - Ache ... She walked funny for 6 hours.
My girlfriend wanted to try anal so I destroyed her pussy and after that I gave her what she wanted anal ...but I fucked her so hard she bled a little and had a Buck-Ache.