The term "making whoopee" is a colloquialism used to describe sexual activity. Antonyms for this phrase would include words and phrases describing the opposite of intimacy or physical affection, such as "abstinence," "celibacy," and "chastity." Other antonyms could include terms related to separation or distance, such as "estrangement," "alienation," and "isolation." Overall, antonyms for "making whoopee" would be used to describe situations without intimacy or sexual contact, emphasizing a lack of physical connection rather than the act of such a connection itself.