block up

a mishap; bad luck
anywhere ranging from stealing to jumping someone for something they want

Person 1: look at that nigga with the new 16 gb ipod touch
Person 2: lets block up on him for it

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blocked up

British slang for being high on drugs.

"That was the weirdest gig ever. The band were obviously all blocked up."

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Kaddish block-up

When multiple people walk into prayers during Kaddish, and they have to stand straight in front of the door. Causing the door be blocked until Kaddish is over.

I walked into prayers during Kaddish and immediately stood straight. Within a few seconds I was joined by multiple other people, causing a massive Kaddish block-up.