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
 Get the pushing the envelopemug.
Get the pushing the envelopemug. by Some random dude,somewhere out there in the lonly November 4, 2003
 Get the push the envelopemug.
Get the push the envelopemug. "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 3, 2003
 Get the push the envelopemug.
Get the push the envelopemug. by Anonymous November 3, 2003
 Get the push the envelopemug.
Get the push the envelopemug.