Singular of Jocks.
Actually, it may just be sour grapes because the conquering thing pretty much went on (Angles, Jutes, Saxons, Danes, Normans and, yes, even the proper Crapauds) until the men in tartan went out and won them an Empire, for which we are thankful. No point getting yourself into the firing line if you can persuade others to do your dirty work for you.
Great doctors and engineers the Scots you know, it's the porridge (copyright T Hancock).
However, in the Scots film Trainspotting, Renton utters the immortal lines:
It's SH1TE being Scottish! We're the lowest of the low. The scum of the fcuking Earth! The most wretched miserable servile pathetic trash that was ever sh@t on civilization. Some people hate the English. I don't. They're just w@nkers. We, on the other hand, are colonized by w@nkers. Can't even find a decent culture to get colonized by. We're ruled by effete @ssholes. It's a sh1te state of affairs to be in, Tommy, and all the fresh air in the world won't make any fcuking difference!
However Renton was both a Hibee and from Leith. His rant should be treated with some dubiety.
See also Elephant Polo(World Champions!).