I'd like to know were you read that. Please list the reference.
In a word, NO! If you feed something to your BP that leaves a bump large enough that it impedes movement, then you fed something too large. A slight lump is acceptable. But even then should be almost unnoticeable.
Feed your snake a prey item that's slightly bigger in diameter than the largest part of your snake. For juvenile BP's the 10% rule is a good place to start. Weigh your animal and feed prey that's approximately 10% of that weight.
I highly recommend you get a handle on this situation.....