Kiss & bajs - ENG & SWE

Living in two different cultures is interesting but also a bit confusing at times.
My two sons had been to daycare in Stockholm, and learned quite a lot of Swedish. At least all the relevant words and phrases for a two and a three-year old. Words like kiss (pee in English) and bajs (that of course means boo!) that together formed the hilarious phrase kiss & bajs, uttered over and over again. So they of course would continue to play with these words that had induced so much laughter at kindergarten. Only in America the reaction was as expected a bit different. Usually it made people confused. But by and by my sons forgot their Swedish - which they didn´t talk with anyone - and kiss became the one word that the surrounding world understood it to be.