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2.
1. Titties below the normal ones.
Also if used as a verb:
2. A desrespectful or harmful action.
1. "You need to have an operation to get that subtitty removed, Ms. Jenkins."

2. "I so subtittied that britch with my mp5 while she was lookin' the other way!"
by Xhelix June 25, 2005
 
1.
suhb-tit-eez
n. Tits so good that the tits got their own titties.
A: yo even her titties got titties
B: naw man those are subtitties
by Master Ching Chong October 16, 2013
 
3.
The titties below the titties.
"What are those titties below your titties?"
"Oh, those are my subtitties."
by Kate December 27, 2008