secret way of saying that a girl has huge knockers
"did you see that girl"

"thats a big 10-4"
by Double D14 December 31, 2006
1 more definition
7 Words related to big 10-4
Top Definition
In the CB slanguage:

1. Hi there!

2. Enthusiastic agreement.
1. I just wanted to say a big 10-4 to ya!

2. That's a big 10-4!
by Downstrike May 29, 2004

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