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2.
Means not to much or so-so. Is typically a responds to the question how are you? or whats going on?
"How are you doing today?"
"Eh, notomato."
or
"Whats going on?"
"Notomato."
by Thomas Theisen February 19, 2007
 
1.
The simplified version or explanation of something complicated. Originated from "no tomatoes on my spicy chicken sandwich."
Give me the no tomatoes explanation why the stock market crashed in 2008/2009.
by Mr. Mauritius June 17, 2013