Catch me at the crib getting light to Jeff Mangum
Getting light= a style of dancing, or smoking weed and getting high.
Jeff Mangum=The reclusive singer of the band Neutral Milk Hotel
There’s also the pun on Mangum/Magnum and the “rhyme about handguns” in the next line (since a Magnum is a type of handgun)
To help improve the meaning of these lyrics, visit “Rainbow in the Dark” by Das Racist Lyrics and leave a comment on the lyrics box