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1.
to agree; to confirm; to affirm; when something is right, it can be deemed confirmative.
"Dude, chicks are for fags."
"Confirmative, I mean really the last time i wear those shorts i got beat up."
by andyfellovernet June 14, 2003
 
2.
to confirm whilst expressing agreement with or consent to a statement or request; yes.
Are you definitely coming next saturday? "confirmative"
by gregs world February 19, 2014