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1.
Someone testing HIV positive
That dude failed his HIF test - he's got the SLIMMER!!!
by Steyn December 26, 2007
 
2.
Person that starts going to the gym to lose an unspecified amount of weight and has no fitness goals beyond looking better in the mirror. This person generally joins right after new years as a resolution to get thin or "slim up."
"There were so many slimmers at the gym I couldn't get on a treadmill."
by Dr. Ferndinand Kovaskis April 13, 2010