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1.
Someone that likes to ruin perfectly good moments, usually with a stupid ass remark or action.
Wow, that guy is such a fuckin cagger.
by Str8PiMpIn March 31, 2008
 
2.
someone incredibaly lucky at getting away with things
"Wow, I can't believe you made that shot! You're such a cagger!"

"Woah I definitely aced that quiz i didn't study for. I'm such a cagger."
by poop June 03, 2004