Bishop73

Corrected entry: During the strip poker game, Kari says, "I'll bet you my thongs." Thongs are what flip-flops were called in the 80's but she was wearing tennis shoes the whole scene, you have to bet with the clothing you are wearing in strip poker.

Correction: Thong is a type of underwear. That's what she was referring to.

Bishop73

This correction is wrong. I remember this movie, so I found and watched it on YouTube and the girl definitely says "thongs", plural, so I'm inclined to agree with the original post that she was indeed referring to sandals and not underwear.