You may have had the same experience as I when hearing people say vice versa. Some pronounce it as vice (rhyming with rice) verse-ah, while others say vice-ah verse-ah. I decided to find the correct pronunciation (if there is one) and as is often the case, they’re both considered correct. The wikipedia entry states that the literal Latin translation is “with position turned”, making the phrase mean “the other way around” or “conversely.” It also says that historically, vice is more properly pronounced as two syllables, but the one-syllable pronunciation is extremely common.
Even though the audio pronunciation (there’s only one) says it with two ahs, I prefer the single ah variation. It sounds less pretentious and I already get enough grief for pronouncing aunt so that it rhymes with haunt, gaunt, taunt, flaunt, jaunt and daunt.