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A person who is in your way. Often fat and usually unobservant to notice where they are.
I can't get through the door. A blocker is talking to someone in the doorway.
blocker by Main Man June 30, 2006
A person who is from one of the former Easter Block communist countries like Russia, Poland, Czech Republic, Slovakia etc...
My girlfriend is from Poland. She's a blocker.
Blocker by Charlie_ July 29, 2008
A person that blocks everyone else 's progress in life.
Blocker people will block you by driving slower than posted speed. or that block you by talking on cell phones while placing an order, or block you by having to call someone to ask their opinion on a possible purchase while in check out. Basically those are blockers that can't make up their mind and stand there blocking every one else from doing their tasks.
blocker by Possumn October 3, 2010
'Blocker' has recently been used in parts South Wales as a word to describe being high or stoned on cannabis.
"I went out and had a coulple of J's last night and I was blocker!"

OR

"You look blocker!"
blocker by Ceri April 14, 2006
One who blocks, or engages in the act of blocking frequently.
Bob: Hey john, whats up with antony lately

John: I don't know, he's being a huge blocker
Blocker by doughmanfro January 10, 2010
Term to describe the species of homosapien hippopotamus maximus beast which inhales big macs and only befriends attractive, desirable females. Follows said slender females around with turkey leg in purse and listens to, influences, and gains approval of attractive friend with the sole purpose of preventing males from reproducing with aforementioned females using various tactics such as lying, manipulation, and social media to thwart repeated attempts of male sex to court, date, and have sex. Sometimes slips in bite of said turkey leg and big mac in between cockblocking victories.
Goddamn fat ashley just snuck a quick big mac in the bathroom. She's such a massive blocker. No one here is gonna get laid tonight.
Blocker by Sirsmokealots June 3, 2018