Noun \ˈtī-nē ˈhärt ˈsin-ˌdrōm also -drəm \

Severe clinical condition in which the affected does not have the resolve to complete a task that has become mildly to moderately challenging. Often seen when one attempts physical activity or a mentally taxing task like texting whole words or adding without a calculator. The only known cures for THS are forced toughening activities (i.e. barefoot 25 mile road marches, playing tag with porcupines, 10 mile runs at a 7 mile/min pace in a minefield, stealing food from a pride of hungry lions, chewing aluminum foil etc.)
“Where is Mike? “

“His Tiny Heart Syndrome kicked in and he crashed on a log with a bag of Cheetos.”

“WTF? We’ve been walking 5 min. We just left the parking lot.”
by Green_Machine November 14, 2013
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Often used in the military, especially basic training. Used to describe an individual who suffers from the inability to properly "man the fuck up" and get through a difficult or trying task.
Drill Sergeant - "Alright you little poster boys for abortion, get your gear and get outside right fucking now. And if I hear a single one of you suffering from THS I will personally beat you until your tiny little fucking heart stops."

"Did you see George cry his way out of finishing work today. Said his head hurt to much to continue on. I'm tired of him never finishing a single thing."

"That prick is a chronic case of THS (Tiny Heart Syndrome)."
by FiveFire November 6, 2009
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