n.
Function: noun
Etymology: probably short for 1 bummer
Date: 1864
1 a : one who sponges off others and avoids work b : one who performs a function poorly <called the umpire a bum > c : one whose time is devoted to a recreational activity <a beach bum > <ski bum s >
2 : VAGRANT , TRAMP
– on the bum : with no settled residence or means of support