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1.
tightening of the butthole. usually induced by an unpleasant surprise, or a feeling of imminent danger. when you know pain is coming.
(from EvE)
Player#1: "he was spamming the warp drive, as my ship was locking him".

Player#2: "he probably suffered the pucker effect".

(Jackass wannabes)
Jackass#1: "Mike, hold still for the camera while I hit you with this bamboo cane".
Jackass#2: .........suffers from pucker effect
by shake weight January 07, 2011