Top definition
The awesome feeling you get after eating the best Subway sandwich in the history of sandwiches.
"That sexy Subway sandwich with Italian Herbs, Cheese bread, and Spicy Italian meat with jalapeƱos, vinegar, and oil gave me one hell of a subgasm last night!"

"Oh Jared! That was quite a subgasm!"
by Jared's Wife January 23, 2010
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