V. To escape or flee under incriminating circumstances.
"He has, to use the common phrase, done a bunk," replied Professor McGonagall, and a great cheer erupted from the Gryffindors, Hufflepuffs, and Ravenclaws." From Harry Potter and the Deathly Hallows
by JB 117 January 13, 2009
leave without permission, unauthorized departure
Ronnie Biggs was doing time, until he done a bunk, now he says he's seen the light, and sold his soul for punk
by paul-e May 27, 2006