when too much information is given about any one (usually personal) subject matter.
see also tmi
person1) omg, i got the worst case of genital warts, they're all purple and gooey...
person2) overshare
person1) but no, you gotta hear about this...i don't know if i got them from my friend's dog...
person2) overshare
person1) ...or maybe i got them that night i was playing drinking games with my cousins...
person2) OVERSHARE...
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