The act of pressing one's penis against a window. The slightly flattened penis gives those on the other side of the window a visual of a "dead rat". This act is particularly entertaining while walking by a bar with floor to ceiling windows on a busy weekend evening.
to be involved in an extremely frustrating and tedious activity with unclear or disappointing results. (origin of the phrase is attributed to an archaic Russian jargon).
1) - Why did John drop out of the grad school after 8 years?
- His advisor was nuts. John was milking a dead rat all this time.
2) Dude, trying to sleep with her before marriage is like milking a dead rat.