Let me hit it from the back, girl I won't catch a hernia
Bust off on your couch, now you got Seaman's Furniture

from A Tribe Called Quest – Electric Relaxation Lyrics on Rap Genius

Meaning

Seaman’s furniture store was a New York area furniture chain that merged into Levitz furniture in 2005, known for furniture that was affordable and not especially well-crafted. The double entendre being that Phife will bust a nut (semen) on the PYTs couch.

In the documentary Beats, Rhymes, and Life, Phife notes that the line has a double meaning — after he busts on your sofa it will seem shoddy and degraded, thus of a similar quality to Seaman’s products.

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