To be too big for one's boots is to be conceited, arrogant, and have too much self-importance. Stormzy is warning someone here that if start behaving as if they are more important than they really are, he won't hesitate to boot them back down to size with his size 12s.
The song was co-produced by grime DJ Sir Spyro and Fraser T. Smith, who is best known for his work on Adele's hit single "Set Fire to the Rain". It was BBC 1Xtra DJ Twin B who introduced Stormzy to Smith.
Stormzy spoke to Beats 1's Julie Adenuga about Smith's contribution, which included the high-pitched vocal sample. "He's] someone who's so skilled and at that upper echelon of the game… I was just looking forward to seeing what happens. Spyro had laid such a sick foundation that the drums were mad and there were chords and they were mad… I had an idea to get a sample in there 'cause I feel like samples are so grime… to get that flippin' old school crud."
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