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Or 'Sack manners', is the unwritten code of ethics used when approaching the groin region. Crotch etiquette is usually breached by those who don't understand the sharp pain inflicted if that particular area is hit.
Example 1;
Damien: I saw Libby sack tap Kieron, that bitch needs to learn some Crotch Etiquette, FAST.
David: I hear that! *high fives*

Example 2;
Damien: That whore Libby was so close to steppin' on my balls the other day.
David: Teach the hoebag some Sack Manners, dawg!
by Zuban! March 10, 2009
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