pitäkää tunkkinne

Etymology
From an old joke or anecdote (with many variations) about a man who gets a flat tyre while driving in the remote countryside. He walks a long distance trying to get help and eventually comes across a farmhouse. He knocks on the door to ask for a jack to help him replace the tyre, but has by then grown so aggravated and pessimistic that when the door opens, he only exclaims "you know what, keep your damn jack!" Some sources state the story may have originated with or popularized by.

Phrase

 * 1) ; (just) keep it, keep the thing, I'm not going to get/buy it; I'll let you/them have it
 * 2) ; screw this, I won't bother
 * 1) ; screw this, I won't bother

Usage notes
A singular form and a verb  also exist, but are still rare.