I had a quick look at some Rumpo lyrics today; there's one reference to somebody blowing "till he's blue in the eek", which is a bit of Polari (eek = ecaf = face), but that was the only example I spotted. A lot of it is just English words which sound funny (truss, groats, artifacts), and the core Rumpo vocab - splod, nadgers, moolies, whirdling, woggler, cordwangle, gander-bag and so on - isn't based on Polari as far as I know. (Lord only knows what it is based on. There's an interesting page about 'nadgers'(!) here, but it doesn't draw any definite conclusion.)