[1] : The Collaborative International Dictionary of English v.0.48

bum \bum\, v. i. imp.  p. p. bummed; p. pr.  vb. n.
   bumming ?. see boom, v. i., to roar.
   to make murmuring or humming sound. --jamieson.
   1913 webster

   to bum around to wander about idly or aimlessly.
      pjc
see also:
bummed bumming boom to bum around 

Bum >> B Words
Bum, definition of term: Bum
bum_pag1.html

Around >> A Words
Around, definition of term: Around
around_pag1.html