mod. excellent. (Surfing and later general youth slang. Having to do with a tube [wave] that is good to surf in.) : That pizza was totally tubular!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: tu·bu·lar Pronunciation: 't(y)ü-by&-l&r Function: adjective 1: having the form of or consisting of a tube 2: of, relating to, or sounding as if produced through a tube or tubule <tubular rales>