When three or more people are talking and walking in a horizontal line and the one in the middle gets pushed into the back by the other two people converging together. Also to be pushed out of a conversation or pushed out of a group of friends. Comes from the word quam, or a very disrespectful name to call someone who thinks theyre friends with you but isn't.
"Hey guys, stop quamming me."
"That guy just got quammed."
Person 1- "Yea, I hate that kid, he always tries to walk with us and talk in our group."
Person 2- "If you don't like him, just quam him out of the group."