This definition appears very rarely
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Acronym Finder has 2 verified definitions for XSO
Is it ever okay to snoop through your significant other's private papers, email, phone, journals etc.?
What does XSO stand for?
XSO stands for eX Significant Other
- Abbreviation Database Surfer
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Samples in periodicals archive:
I keep having dreams about my ex-significant other (we have been broken up for six months). The dreams aren't about getting back with him; just about talking to him.
The Ex significant other joke thread. General NON-Automotive Conversation
(Ex) significant other is used in Emoticon. The word (x)SO is used in Emoticon meaning (Ex) significant other
Dear Miss Manners: My significant other told me she would like to continue the friendship but abandon the rest of the relationship. Although that took some getting...