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To get wendy with someone means to get testy, which sounds like wendy testaburger. Is often used to avoid incitation to say the word testicles.
Coons: Jeff you have some trig over here that needs to get done.
Jeff: Oh come on, are you fucking joking me!?
Coons: Now don't you get wendy with me young man!!
by DooDooMan November 28, 2007