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1.
To forcefully shove a bottle (size may vary) up the anus of another individual for sexual pleasure.

Last night, Nicole was roughly bottle-capped by two rather large asian twins. However, she enjoyed the experience, and they plan on another rendevous next Friday.
by youonlywishiwouldtellyou December 23, 2006
 
2.
The act of inserting a bottle cap into a mans penis hole then hammering it in deep. After that cover his dick with wet salt and then make 100 little cuts on the penis using an exacto knife. After that cut off his cock using a blunt hatchet and mail the mutilated penis to blizzard
I bottlecapped myself because kalgan wont nerf warriors
by acarpish March 15, 2008