Oh Yeah? is a verbal return to an action or more likely the oral depiction of an action (that may or may not have happened) to which the author of this phrase does not like. This is usually quite a startling
way of saying "Over my dead
body". Oh yeah? is 'most always followed by physical
violence and expletives galore.
Traffic
cop: Sir, I'm going to have to tow your car, you parked in the disabled
space for two minutes.
Gumba: Oh yeah? Here's a better idea, you goddam little ratbastard!
*sound of nose being
broken*