piss in the wind

Alternative forms

 * spit into the wind
 * spit in the wind
 * piss into the wind

Verb

 * 1)  To waste time on a pointless or fruitless task; do something that is ineffective or counterproductive.
 * You can make a complaint if you like, but you'll just be pissing in the wind.

Synonyms

 * fart in a windstorm
 * piss up a rope
 * whistle in the wind