RadioKid, we in Texas (maybe other places in the US as well?) have a saying: "queer as a three dollar bill." I think this is the "odd" usage rather than "homosexual" usage in this phrase. I think this is an acceptable idiom to use, although I don't know if you want to sound Texan or not.
The point of the phrase is that there's no such thing as a $3 bill, so a $3 would be odd (i.e., queer).
Fake denominations of United States currency - Wikipedia, the free encyclopedia