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1.
Informal way of saying "bad influence".
-Tim and Jack are really bad apples for you.
by Kaduchi August 18, 2009
 
2.
1. In the classical sense: A criminal beyond rehabilitation

2. In more modern terms: The opposite of apple bottom. A butt that's beyond the point of being nice and shapely and is just plain fat.
Usages:

1. George got sentenced to a double life term in federal prison. Growing up, people always knew he was a bad apple.

2. Guy 1: Yo, have you seen Kim? She put on mad weight son.
Guy 2: Man, she's sportin' some bad apple.
by Qual April 25, 2006
 
3.
a male with an STD
Girl 1: See that cute guy over there? I'm taking him home tonight.

Girl 2: Don't eat from his tree! He's got bad apples.

Girl 1: Oh sick!! no one likes a bad apple!
by aintthatneat January 01, 2012
 
4.
a tampon that doesn't get inserted properly. generally, it hurts, so it needs to be removed.
"Hey Annie, can you grab me another tampax? I just got a bad apple."
by loveleeme October 17, 2009