When two or more people try to convince you on something you are not eager to accept. But at some point, you start pretending you are convinced to shut them up.
P1: Jamie and Dave tried to convince me on how good vinegar tastes and how good it is for health.
P2: That's total crap, vinegar sucks.
P1: I tried to tell them, but they wouldn't shut up until I gave up.
P2: Lame, you've been crossfire bullshitted.