We found one dictionary that defines the word slow one's roll:

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1. slow one's roll: Wiktionary

Definitions from Wiktionary (slow one's roll) ▸ verb:  (informal) To calm down. ▸ Words similar to slow one's roll ▸ Usage examples for slow one's roll ▸ Idioms related to slow one's roll ▸ Wikipedia articles (New!) ▸ Words that often appear near slow one's roll ▸ Rhymes of slow one's roll ▸ Invented words related to slow one's roll