A portmanteau is a blend of two (or more) words. The term was invented by Humpty Dumpty, whose other achievements were being an egg-man and falling off a wall. So really his biggest talent was in word-mongering, and that should be the basis of his celebrity today, not his headline-grabbing clumsiness.
Anyway, those two words are:
- Slur - to garble or run words together.
- URL - which is short for Uniform Resource Locator. No, not a way to find a French Maid's outfit but the techie term for a web address.
So there you have it, a Slurl is a garbled web address.
* Seriously though, the term "portmanteau" was devised by Humpty - it first appeared in Lewis Carroll's book Through the Looking-Glass, in which Mr Dumpty explains to Alice the origin of two portmanteau words in the poem Jabberwocky: slithy and mimsy.