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1.
The intense feelings of extreme pleasure one gets from watching Leroy Jethro Gibbs, as portrayed by Mark Harmon on the hit tv show NCIS
person 1: OMG, did you catch that new episode of NCIS last night?

person 2: Ohhh yeah! I'm STILL having Gibbsgasms just THINKING about it..
by GibbsGirl January 21, 2010
 
2.
The peak of sexual excitement which is causally related to a gibbs.
"Aron gives me a gibbsgasm."
by steven9807 October 18, 2011