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The mysterious taxi that takes you home when under the influence of alcohol. You may have forgotten about this ride home because you were so intoxicated.

Can also refer to a buggy like car or small vehicle that does not drive very fast.
" I was so crippled last night I came home on the boomwagon"

" Last night I got absolutley Boomwagoned'

" Lets go out and get boomed"
by Phil Brown June 16, 2006
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