もう君の尻拭いはごめんだ。

now; soon; shortly; before long; presently; already; yet; by now; (not) anymore; further; more; again; another; the other; interjection used to strengthen expression of an emotion (often exasperation)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

cleaning up or covering for another; bearing the consequences of someone else's error; paying a debt for someone; wiping another's buttocks

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

your pardon; declining (something); dismissal; permission

be; is; indicates past or completed action; indicates light imperative