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3.
A mixture between the terms chill out and allow. No-one really knows what this means.
Um... chillow, dude, chillow
by rorz758 July 14, 2006
 
1.
The cool, refreshing underside of your pillow.
It was getting really hot in bed, so I flipped to my chillow.
by Count Suckula May 30, 2007
 
2.
A pillow that has been left outside the blanket and has now become reasonably cold.
This is ideal for any sleeping situation.
I finally got into bed and realized I have a new chillow.
by JD Rips April 19, 2010