rear up 

to stand up on hind legs (in the case of animals)

The dog reared up and licked my hands with his floppy tongue.

rear up by citizen of the world July 3, 2005

rear up 

to lose it with somone in a moment of anger

he totally reared up at me...

rear up by amber November 26, 2003

rear it up 

for one to get ready to receive anal sex from a partner of the same or different sex or species.

get ready to rear it up to that dog hoe

rear it up by Thaddeus buttshaft July 8, 2011

coming up the rear 

When you ejaculate during anal and you pull out then drag your penis all the way up your partners ass

I was coming up the rear last night

coming up the rear by Comin up-that rear July 21, 2016

Rear Admiral (Upper Half) 

Same as rear admiral, but performed while the man is engaged in anal sex with the woman.

This is a pun on the naval grades of rear admiral (lower half) and read admiral (upper half) which are equivalent to an army/marine/air force brigadier general and major general respectively.

Light brown stains with red sprinkles testified to my first successful completion of a Rear Admiral (Upper Half) in the lobby of the motel 6.

Rear Admiral (Upper Half) by gunfest 2008 February 23, 2009