ball dropper 

1) One who is depended upon to complete an integral function of a larger task, but fails in a manner which nullifies the efforts of the others involved

2) One known notoriously for "dropping the ball" (see above) often.

"Ok, joe can get the keg and rich can make up the posters"

"wait, Joe can't get the keg, hes a ball dropper, have bill get it instead"

ball dropper by Meredith July 15, 2003

ebay ball dropper 

A seller who sells something he doesn't have. Usually someone who plans to by locally with the buyers money and make a profit. Either the final bid is lower than the local cost, or the merchandise isn't available . Asking for a shipping date usually results in insults or threats but no shipping date.

Getting what I paid for from that ebay ball dropper was like pulling teeth.

ebay ball dropper by mikie the yorkie March 15, 2008

Upside-Down Crane Dropper With Wrecking Ball Attachment 

A sex position, invented by a future Principal and his former student, where the girl lays on a bed with her head dangling off. The guy, with penis erect, drops the crane directly into the girl's mouth. The girl then proceeds to give a sweet blow job. (This is the upside down crane dropper). The Wrecking Ball Attachment is when the guy reaches onto the girl's vagina and stimulates her. Women tend to like this move much better than the Upside-Down Crane Dropper. It's awesome.

I put my girlfriend in the Upside-Down Crane Dropper With Wrecking Ball Attachment and she loved it!

Upside-Down Crane Dropper With Wrecking Ball Attachment by Junior Whatacock August 16, 2014

dropped the ball 

To screw up a major opportunity, that possibly comes along only once in a blue moon.

"One keg of beer, two blonde twins, a hotel room, and an endless supply of rubbers. Think he shagged them? Nope. He dropped the ball."

dropped the ball by D. Gould February 15, 2006

dropped the ball 

When Randy Moss fucked The Patriots over by letting the ball slip from his fingers with less than a minute left in the 2008 Superbowl.

Randy Moss sure dropped the ball, what an epic failure.

dropped the ball by PatrikM January 11, 2009

Dropped the ball on my ass 

To forget to do something important on-time, like an assignment

I totally had an assignment due last night and I didn't remember until now - I totally dropped the ball on my ass.

Dropped the ball on my ass by glennasaurus October 8, 2010

dropped the ball 

Someone fucking something up because they're incompentent or weren't paying attention, thusly fucking themselves and possibly others over.

Biff: Christy sure dropped the ball on this whole Christmas party thing, now I have to come in this Saturday to help decorate.
Joey: That blows dude, she should be fired.

dropped the ball by Gamblar December 10, 2008