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A person who will do anything to please another or will copy them.

Can also be used as a verb : licking bum.
You: "I like dat TV show, it's well safe."
Friend: "Yeah innit, well safe."
You "Ah, you're just a lick bum."
by Terri March 05, 2005
a term used to describe one who is a suck ass to someone about something they are or have.
'Hey jack johnson your rate smart'' *Muffled*'LICKBUM
by CoreyRodgers&Abbie May 02, 2011