It's MOOn men
Men from the MOOn have very unusual culinary tastes. When asked what dish they prefer they mUDDER that they prefer something udder than the usual cuts of grade A and tender sirloin.
"I prefer eye poached on ear d'ya hEAR!" said one particulary incisive MOOn man as reported by a farmer on the scene. "That other meat just doesn't CUT it!"
The MOOn men have no money because they use MOOney instead. As a result, they are forced to poach on farmers livestock when they vacation here on EARth. They COWer in fear of discovery and take their food to go.
The angry farmer watched their craft depart and shouted after them, "MOOnmen are nothing but MOOchers! Get your fast food somewhere else!"
________________
I know...this joke is in bad taste.
;-)