Strike matches on white patches of dry lawns
And I run and jump right in front of the fire hydrants

from Eminem – Rap City Freestyle Lyrics on Rap Genius

White patches on lawns can be caused by many things, such as fungus, but are usually the result of dry grass. Dry grass, like nylon and rayon (and blondes) is well-known to be extremely flammable, so Em burns that shit up and blocks the fire hydrants (something that he does often, apparently)

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