Phrase coined on the Something Awful forums meaning "later" or "peace out" in a somewhat dismissive tone; implying that one will always be watching over you from the far reaches of space, or that they are infinitely higher than you are (physically, metaphorically, and even in reference to marijuana use).
Newpote: yo cuddy! that was some bomb herb!
Bagweed: hell yeah son. gotta ghost tho. this cutie in the jeans eyeballin me like she hungry. c u frum spaze.