bastard(The bastards have figured out how to fight and they understand our tactics but that doesn't mean we don't understand their tactics or that we won't continue to take them down.)
bugger( It's a mainly UK/Aus/NZ term. The original meaning of the noun – "a man who commits buggery' – has been in declining use since the 1960s/70s and is now rarely used. Nine times out of ten it's now used simply as a mild slang word for "person" (male or female), especially when you're slightly annoyed with that person. When used as such the sexuality/sexual behaviour of the person concerned isn't being referred to at all, e.g. • Our neighbours are funny [=strange] buggers – they never talk to anyone.; Comment by johnstephenson)