My nigga moved so much Britney Spears
They gave that boy Kevin Fed time
Fed time, Fed time, locked down all day

from Fabolous (Ft. Meek Mill) – You Don't Know Bout It Lyrics on Rap Genius

Another name for cocaine is white girl, and pop starlets' names (Britney, Lindsey Lohan, etc.) often stand in for that nickname (cf. Jeezy’s “White Girl”). Britney was married to dancer and “rapper” Kevin Federline, whose name Fab puns on to talk about time spent in Federal prison

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