What does YBWM mean?
You Belong With Me
Other definitions of YBWM:
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How to use the term
YBWM:
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More slang terms:

Wubba Lubba Dub Dub
A catchphrase from the Adult Swim show "Rick and Morty". The titular, scientist character Rick employs the expression as a zinger throughout the series after his many quips and remarks. A character, Birdperson, reveals in later episodes that the term actually means "I am in great pain, please help me." in their native tongue; this revelation indicates that Rick is actually using it as a cry for help.

AYBAB2U
All your base are belong to us

AMZ
Amazing

PENDEJO
Refers to the Spanish word for "stupid" — usually applied to a person who is acting foolish.