look up any word, like fob dot:
 
4.
comes from the root word fellatio which is a blojob. means "it sucks"
I thought this cd would be good but its fellacious
by Drew May 11, 2004
 
1.
1. A lie or misinformation.
2. Plural form of fallacy.
A fallacious argument.
by rudeanduncouth May 13, 2004
 
2.
Function: adjective
1 : embodying a fallacy
2 : tending to deceive or mislead : DELUSIVE
- fal·la·cious·ly adverb
- fal·la·cious·ness noun

(Merriam-Webster)
1 : a fallacious assumption
2 : fallacious testimony
by Dissipate May 12, 2004
 
3.
Describes something that is commonly believed to be true, but is in fact false.
The arguement was based on fallacious reasoning.
by Kevin Watkins May 13, 2004