Just no. These attempts to rhyme “orange” are strained at best, tortured mostly. It’s not a trope, it’s just a fact. “Hinge” doesn’t work either. It’s ok. Not every word has to have a rhyme.
Anyway:
Oar Hinge?
Ok, the proper term is probably oar lock, but… 
Well put. “Orange, shmorange”.I always say.
There are two hard problems in computer science:
Naming things, cache invalidation, and off-by-one errors.
Nobody expects a divide by zero exception.
The horse jumped the fence but onto the wrong property.
He made a fence-post error.
(I just made that up. So sue me.)
“Let’s use multithreading!”
three Now have. problems we we we we we
In the category of “jokes that need the Oxford comma to work”. 
Perhaps the German friend thought the question was about a music group or artist, such as +44, or M+M, or 3.
O, ridge?
(Topographical features should be lauded.)
If rhyming things with orange
Gives you a hard time
You simply need a more ing-
enious way to rhyme.
As someone who has been ridiculed for my regional pronunciation of ‘orange’ (rhymes with ‘syringe’ where I grew up) I have to say I am not buying what you are selling. I think Eminem brings a critical lens both to a lyricist’s creativity with rhyming (i.e. it’s not all moon/june/soon/), but also to the ‘facts’ of common wisdom.
Certainly, we can agree that any and every word has a rhyme with nonsense speak (surely ‘orange’ rhymes with ‘porange’ yes?), but that leads pretty quickly to onomatopoetic rhymes, and, as Eminem deftly illustrated to rhyming across multiple words, and with creative use of inflection and pronunciation. These approaches to rhyming are also ‘facts’. You definitely do not have to like them! But then there’s the geek culture wisdom about not yucking others’ yums.