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When a woman in on her period (aka "up on blocks"). Similar to "lockdown"
We can't have sex this weekend because my girlfriend is on blockdown.
Blockdown by Anthony Gentile May 12, 2007

Buschman Blockout 

praeternatural knack for alienating half of the group of people one is with when seated at a sporting event or concert; analogous to cock-blocking other would-be participants in a conversation. Etymology: In 1996, during a St. Louis Cardinals game at Old Busch Stadium, one of the descendants of the Busch family turned 90 degrees, thus shielding four of his fellow Cardinals fans from the conversation among a group of nine. Then, he reversed field, and alienated the other four before alternating sides and frustrating fans of all ages well into extra innings.
Tommy was thrilled with his seats at the Coldplay concert until after the opening act, when Greg turned to talk to Joel and then gave Tommy the Buschman Blockout for the rest of the show.

blocktopus 

a good friend that protects his or her friends from getting into regrettable or dangerous sexual situations
(term comes from using all those arms, or the available means, to block the bad business)

IMPORTANT: This friend is NOT a cock block. The blocktopus only steps in if his/her friends' comfort or safety is at risk.
Example 1)

That guy at the party last night was getting really creepy with Laura, so I had to be a blocktopus and get rid of him.

Example 2)

Dude 1: "Hey, man, what ever happened with that girl from the club?"
Dude 2: "Nothing. I couldn't tell she wasn't into me, so I'm glad my blocktopus was there, otherwise things could have gotten sketch."
blocktopus by #1blocktopus November 14, 2013

cock blocktopus 

A person who seems to simultaneously cock block eight people.
Man, our group of eight friends stumbled upon this group of nine ladies, but one was such a cock blocktopus that none of us could get any play.

Cock-Blockdown 

When you're horny as fuck for some Tinder dudes cock, to give you a good pussy pounding, but this Covid-19 has you on lockdown
Cheers to Covid 19, for being the biggest cockblock in 2020. Just rang my beak dealer and offered my pussy out for a gram of bash. He is self isolating, so no cock and no bash. What a Cock-Blockdown this is!!!
Cock-Blockdown by Anna Key DnB April 28, 2020
Friend #1: "I'm tired of Joe posting sarcastic messages on my status updates."
Friend #2: "Girl! You need to put him on BlockDown!"
BlockDown by Lolita75 January 16, 2010