[aidenn0]

It's an archaic britishism. The only time I've ever seen it actually used is in the works of Morgan Howell.

[jonathonf]

Not all that archaic. Male sheep kept, or just added to a field, for breeding are known as tups (which are distinct to rams).

[nevhan]

Shakespeare uses it in Othello, learnt something in 9th grade English!