A term that can be traced back to five potheads in Richfield WI, used to describe when a person takes a hit from a water fall/gravity bong and inhales the smoke to the point that the water touches their lips. This usually results in some water being taken in and quickly spit out.
A persons abilitly to Man Sip is based upon the size of the bottle they are able to clear.
20oz= Weak Shit
32oz= Not Terrible
2 liter= Average
3 quart= Pretty good
1 gallon= Damn fine
Did you see Bear take that man sip? I can't believe he could clear a bottle that big! He's going to be a silly bear tonight.