Someone who frequently engages in excessive, random fornication with anyone or anything.
A: Ciaran had sex with ten girls, four sheep and a fire hydrant last month!
B: Wow, I envy his stamina. What a Mad-Shagger!
fornication, sheep, fire hydrant, shag, bone
Someone or something that is commonly having sexual inter-course with a significant other.
“Dude he’s a mad shagger…”