To relieve yourself as the opportunity presents itself, in anticipation of and extended period of time where you may not have the resources to do so, even though you may not currently feel the need to relieve yourself.
"Baker is the next rest stop, and it's not for 120 miles, I better top down while we're stopped".
by Gary T Money December 06, 2007
1 more definition
Bald man. No hair on the head.
That nigga has his top down today.
by rumplespunk October 14, 2007