Someone incredibly dull and boring who has very 'safe' tastes and no personality.
"John is so lame..."
-"Yea, that guy is a manilla envelope."
by Teeto86 April 19, 2010
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When one makes the vagina wet and uses the "juices" to seal a Manilla Envelope and mail a letter to his Grandmother.
On Phone after Manilla Enveloping:
Grandma: Thank you for the letter Jonny, but why does it smell like fish?
Jonny: It went through France and Lindsey says your welcome.
by TrunkKid October 8, 2006
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