When it rains it pours, grab a teflon poncho

from Joe Budden (Ft. Crooked I, Joell Ortiz, Nino Bless & Royce Da 5'9") – Slaughterhouse Lyrics on Rap Genius

Meaning

A double similie, one being for rain being bullets or gunfire, and two for them to be showering you, hence the need for a teflon (bulletproof material) poncho (something that covers your entire body)

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