There are many synonyms for the phrase "damn it/you/him etc." that can be used in different situations. Some of the more polite alternatives include "darn it/you/him," "bother it/you/him," and "blast it/you/him." For stronger emotions, one might use "curse it/you/him," "swear at it/you/him," or even "cuss it/you/him." Other colorful phrases include "son of a gun," "fuck it/you/him," and "hellfire." In more humorous contexts, one can use "drat it/you/him," "rats," or even "fudge monkeys." Ultimately, the choice of synonym will depend on the speaker's level of frustration, the audience, and the tone of the conversation.