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1.
the act of using sexually explicit language in an attempt to get your partner sexually aroused. Can be done in person or over the phone. (When done over the phone is refered to as Phone Sex.
Couples sometimes try talking dirty to turn one another on:

Guy: I want to f*ck you so hard.
Girl: You make me so horny.
by Cass.ie. June 02, 2007
141 53
 
2.
When someone is talking to you and you dont understand or have a clue what they are talking about. Simply tell them that they are "talking dirty" to you.
Timmy was talking about cars to Amanda, therefore he was talking dirty.
by Sydalee June 13, 2007
25 119