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"And then they have sex." From the X-Files fandom
"In fact, Mulder and Scully are constantly being shot, stabbed, or otherwise critically injured, even beyond what we saw in the show. Again, this results in time spent being cared for by the other, ATTHS."

( from the "Thirty-Five Things I've Learned From X-Files Fanfiction" post on the lj community for X-Files )
atths by J Cook June 25, 2008
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Means: AND THEN THEY HAD SEX. It is used by the X-files fandom. When someone writes "atths", he wants to say that Mulder and Scully had sex, which is very rare occurrence
Gillian Anderson on Twitter: "ATTHS (And then they had sex), twice."
Atths by Voodoo Child. March 11, 2018
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