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1.
To shoot a load into a girl/guy 's mouth.
"Last night I gave that girl a jawful!"
by Qwertyzzzzzzzzzzzzz March 30, 2008
 
2.
A derivitave of jawsome -- very, very awful.
"Did you like the movie?"
"No! It was jawful!"
by Daddy Warbucks April 20, 2004