2) Verb- When one says they're "making" balloon animals, it means they are having or going to have sex. This is done to secretly suggest that one is having, going to, or had sex.
2) Guy asks his friend (in front of his parents), "What did you do last night?" Second Guy: "Ahh nothin, the girlfriend came over and i made some balloon animals. Even one time in the shower." (parents remain oblivious)