What does Abbr mean?
An abbreviation of the word abbreviation. An abbreviation is the shortening or contracting of a word that still represents the whole.
Other definitions of Abbr:
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How to use the term Abbr:
Dr. — Abbr. An honorific for a doctor.
More slang terms:

4LYFE
for life

BYKT
But You Knew That

4TW
For The Win

BOO
An affectionate term for referring to a significant other.