(figure of speech) referring to something small that is difficult to find in a large space, it quite literally would be like searching for a needle in a haystack, obviously nigh impossible.
Mike Clark liked to laugh at pictures of men modeling nude. If they had a small penis and a hairy scrotum, he would say that their package looked like a " MOUSE ON A HAYSTACK ".
A Dick in a haystack is a fun game that requires two people. The game starts when the pubes are longer than the penis, and the servicer must ravage through the brillo and find the serpant. Once found, suckage is a must.
Hey, before you go to work, lets play "dick in a haystack"
Hey bro, last night while i was playing on my gamecube with my other bro, just chillen, we decided to pop in a john mayer CD and play Dick in a haystack, is was fun! i liked it!