Top definition
To turn up for an event early, then leave before everyone else gets there.

Dan turned up at 4 o clock, even though we agreed to start playing at 5, then did a Hallows.
by OiBrent October 06, 2008
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2
Also used in JK Rowling's last Harry Potter book title.
by cadences December 21, 2006
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3
another term for being loose
"Damn, Matt is very hallow.I wouldn't want to touch that!"
by MCbeshin April 04, 2009
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4
Hallow=Hello
A greeting used in forums.
by Pixie April 23, 2005
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