Terminology used by players.
A blocker is a player who intentionally fails or kills other people.
If you see someone blocking you can report him on the discord server in the #reports channel.
These are servers based on the DDNet mod where you can block freely.
Edging (or 'to edge') refers to the move of placing yourself on the edge of a block, where you are out of range of blocks like freeze, teleport or kill which are on top of the block you are on.
In race terminology, this is also referred to as 'buguse'.
This is a common term used by players to refer to the state where you can no longer progress on the map, be it because everyone is frozen, or you can't do a part alone and your partners are not in a place you can reach.
We refer to this term for map parts where you can fail.
Example: "you flw?"
Asks you to follow onto another server.
A solo part at the start of a cooperative map, that needs to be passed by everyone before they can start the map.