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When you have just taken to many drugs over the weekend, its sunday night work starts tomorrow and you are paronoid and depressed the underbus picks you up.
Went a bit mad last night im on the underbus today.
underbus by Mark Lyons November 18, 2006
Related Words
The act of disowning a close political ally, advisor, or family member who says or does something endangering a candidates election chances
Wow, it sure didn't take Obama long to underbus Wright!

Yeah! Even faster than he underbussed his Grandma. . .
underbus by Wind Rider January 14, 2009
A new way of saying Tube/underground when relating to trains. because an underground train is just an underground bus, or an *underbus*
I will get a bus then I will get the Northern Line on the underbus from waterloo
underbus by Sophierules March 26, 2007

Underboss 

Member of a mafia family, typically directly underneath the Don. Handles the mundane details of running a crime family.
The underboss put the capo in charge of making sure the hit was carried out.
Underboss by Roberto Manchez December 29, 2004

underbugger 

A person or annoyance that gets under ones skin and bugs them.
That squeaky door is a real underbugger. I think that new girl is an underbugger, she wont shut up.

UnderLust 

An alternate universe of the game UnderTale containing almost everyone as lust filled monsters, and Mettaton EX as a shy talk show host.
UnderLust was created by nsfwshamecave on Tumblr.com
UnderLust by DepressingVoice16 June 28, 2016