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1.
-Absent-mindness

-A low-level of attentiveness to your surroundings
"My computer was stolen out of my backpack and three days later I noticed it was missing. I totally pulled a Tiner."
by Cincy3557 September 06, 2011
 
2.
more specifically 1/8 oz of cocaine or 4.6 grams
The tiner I brought to the party got us all high.
by Ryan Ka September 23, 2006