If I can pick for a minute
A manual is basically a wheelie without the pedaling. Causing extreme pressure on the knees and lower back and shoulders.
a Feeble grind/stall is a trick/stunt where the front wheel is on top of a ledge of any sort and the back peg is on the ledge.
a 180/360/540/720 are the most common rotation seen on a BMX, not only done in a bunnyhop also off a launch ramp, quater pipe, hip jump, etc.
a X-UP being crossing your arms while still holding onto the bars so your ARMS form a X.

Manual - http://www.angelfire.com/vt/probmx/gallery/manual.html
Feeble Grind - http://www.angelfire.com/vt/probmx/gallery/feeblegrind.html
X-UP - http://www.angelfire.com/vt/probmx/gallery/xup.html
sorry for the ugly pictures. I gotta get some video on the calgary riders site too