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1.
An acronym for Zim and Tak romance, used in INVADER ZIM fanfiction and fanart to describe a (virtually impossible) romance between, Zim and Tak, uh DUH. Most fanfiction in this catagory is written by fangirls/boys who aren't into Xenophilia, but want Zim to find love. Enter Tak. There are few actually GOOD ZATR fics out there, but they DO exist.
Fangirl#1: That ZATR was so BAD and OOC that I was about to puke!

Fangirl#2: I KNOW! I mean, REALLY! She HATED him eairlier, but now she realizes she LOVES HIM?!?!?!?! IRKENS CAN'T LOVE!!!!

Random ZaDR fanboy: YES THEY CAN!!!!! ZADR ALL THE WAY, BAYBEH!!!
by kirichan June 20, 2009
 
2.
An acronym of Zim and Tak Romance. Though most good ones always involve Tak hating Zim and her feelings not changing for AT LEAST a few paragraphs.
ZaTr is so wrong it's right!!!
by Cheyenne Stephens July 06, 2008