It's a bet that Stan and Steve makes. Stan puts a bowl of home made baby food in front of Steve. If Steve can finish the entire brown using only his hands, he wins the bet. If he doesn't, then Stan wins the bet. If Steve wins, Stan has to wear a dress for a whole day like the one in this picture
https://preview.redd.it/gz6dll34wrv4...=webp&84f3afdd and if Stan wins, then Steve will be treated like a helpless infant for a while day. He won't be allowed to walk, waddle, talk normally, feed or dress himself.