A sex act in which one person is tied to a bed and a sheet with strategically-cut holes placed over them, through which a second person has sex with them.
"Looks like it's time to buy new sheets. The wife and I were really pushing the envelope last night."
by mr. wangdangle November 17, 2011
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"stretch the limits" - to go further (in any field) than anyone or any group has done before. perhaps doing something that wasn't previously thought possible.
dude, that quadruple-backflip double-twist one-handed going backwards while blindfolded and sucking a lolly (deep breath) surf manoeuvre was really pushing the envelope.
by Smiff November 4, 2003
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To outdistance everyone else in an activity - set a new standard or precedent
by Anonymous November 4, 2003
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