look up any word, like swag:
 
1.
1. Border Sardine - Term used to describe any illegal immigrant crossing the border to U.S. from Mexico, usually in cramped vehicles.
"Damn man I was at Filly B's last night, that place was full of border sardines!"

"I heard the Border Patrol caught another load of border sardines downtown last night."
by Skeevy Weave May 19, 2008