asshole stop
When hiking, stopping only to let those behind you to catch up and then quickly continuing without letting them rest.
The hike was great, but I am really tired because Colin's friends kept pulling these asshole stops on me.
Sudden Stopping Assholes
When you are walking down the street/store aisle and the person immediately in front of you suddenly stops and you step on their heels and/or trip over them.
Tom: I was walking down the street the other day and the idiot in front of me suddenly stopped and i tripped over him!
Bob: You should watch out for Sudden Stopping Assholes.
Bob: You should watch out for Sudden Stopping Assholes.