What does Condo mean?

"Do you happen to have a condo on you?" she whispered to her housemate.

Dutch student slang. This is a Dutch word. You will hear it a lot at Dutch universities, student associations and in student houses.

It is the simplest way to avoid chlam and other STIs. Depending on the city or friend group you also hear connie. Or regenjas, which means raincoat. Also read what hookup means.