Wiktionary
dribble glass
n. A drinking glass with hidden holes that spill the drink when tilted, used as a prank.
Wikipedia
Dribble glass
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.
Usage examples of "dribble glass".
All practical jokes supported Mike's thesis, even ones as mild as a dribble glass-and when it came to an interne'S notion of a practical joke-Well, internes and medical students should be kept in cages.