All right Pook. It's go time. Let's pick nits.
A 'mathematical oxymoron' would be itself an oxymoron, since oxymoron is not mathematical but a figure of speech. Rhetoric allows delightful ambiquities such as oxymorons, mathematics doesn't - it's either right or wrong. Unless I have been deceived, mathematicians are capable of using words and words can be used to describe mathematical concepts. The descriptions may therefore include an oxymoron: "a four-sided circle".
But that's completely besides the point.
If you had read the thread, you would know exactly what I meant: Wiki's "unicursal maze" is oxymoronic according to the terms it outlined, which distinction, as a matter of fact, was not initially referred to by me as mathematical, nor even Wikipedia:
but modern scholars of the subject use a stricter definition.
Now, if you please, let my nits be.