A dribble glass is a drinking glass that has holes hidden in the etched design.
The purpose of a dribble glass is for pranks. When a person tilts the glass to take a drink from this glass, they will end up spilling the liquid on their clothing as the drink trickles through the holes.
The dribble glass was invented by S.S. Adams.
References
Dribble glass Wikipedia(Text) CC BY-SA