Associated with gay men into kink. Quite often associated with bottoms. It can mean a range of sexual behaviors from licking armpits or having sex after running around all day without having showered, to unprotected sex and requiring the top cum in your ass and ass-to-mouth, to anything involving pee, sometimes it can imply a fisting, scat or blood fetish.
It's a pretty vague term although often associated with being kinky and implying being a bottom.
Talk to a sexual contact about what you are comfortable doing, including communicating risk factors.
He's an insatiable bottom, definitely into pig play.