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1.
abbreviation for residual high; a sense of being high a day or two after the actual act of smoking marijuana, sometimes lasting up to a week.
1. Dude...I smoked like two days ago, but I'm definitely feeling pretty residual today

2. Oh man...I've got major residual today
by SenorFrick January 11, 2009
 
2.
The residual effects of smoking an L late at night. Could result in early morning fatigue and/or confusion.
Dude, we were up so late smoking last night. I am totally feeling the residuaL effects today.
by L-time April 21, 2009