Something that is more than most. More than mostest, too (because apparently that's in some dictionaries).
Maddy: I love you, Hannah.
Hannah: I love you too!
Maddy: I love you more!
Hannah: But, I love you most...
Maddy: I love you mostest, though.
Hannah: I LOVE YOU MOSTESTESTEST.
The sexual act of keeping your partners legs firmly together whilst you attempt penetration. Can also be used in the same vein post penetration and in many situations where instead of parting ones legs, you must keep them shut tightly together, thus its name.
My girlfriend made me Reverse Moses her last night, took 20 minutes to get the tip in, but damn was it worth it!