An old boss of mine after working stooped over for long periods and saying he needed to stretch or else :
“I’ll look like a monkey humping a jug” or
“I’ll look like my tie is caught in my zipper.”
(I like the first one better!)
"It's colder than a well digger's *ss."
We actually bought a T Shirt in Bejiing that had a monkey humping Sponge Bob.