"Boning" (to bone) means basically "killing undead skeletons to obtain their bones". It's a term used mostly in communities based on games (namely Minecraft), where such action is possible.
Making love to a beautiful woman. Screwing a babe. (Usually the first time; first sexual encounter.)
Bart had flirted with Tina in the office for months. She seemed out of his league though; he probably had even placed her her on a pedestal. Yet tonight, here he was, screwing her... boning the prime cut... and she was loving it with him.
A boning marathon is an incredibly erotic time when a couple has tremendous sex for extended periods of time. A boning marathon often lasts for upwards of two hours. It takes indredible endurance from both the man and the woman. A boning marathon is often started after alot of drinking. As we all know, drunks last longer....if not forever. You can usually identify the participants of a boning marathon by their walk. They usually walk a little funny after hours and hours of hoTT sex.
My girlfriend and I got drunk and ended up having a two hour boning marathon.......hoTT!!!