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High on large amounts of stimulants (MDMA, cocaine, Ketamine, M-Kat, etc)
She was completely pinging after she dropped a bomb of MDMA.
Pinging by Waveyef June 1, 2015

pingdingo 

An exceptionally large pink cock on a white man. Derived from mandingo.
Did you see that pingdingo? It's as big as my BBC!
pingdingo by belindakebab May 10, 2019
When you are high on MDMA

Some people call Ecstasy pills 'pingers' so when you're high on them you are 'pinging'.
my mate took a pinger and was so pinged. he was pinging like mad
Pinging by Astric1 August 8, 2018
Very agitated and over-stimulated. A person "pinning badly" is nearly having a nervous breakdown. Causes are drugs or a recent extremely stressful event. Major symptom are rapid speech, often with quick series of logic jumps. Minor symptoms include wide-open eyes, with darting eye movements.
You need to relax; you're pinning bad.
pinning by Kingdragonfly July 7, 2015

pinning their ears back 

Taken from what a dog does before it attacks. It means to charge or attack with full ferocity.
The quarterback is in trouble now. With no running game, they have to pass every play so the defensive line are pinning their ears back and rushing the quarterback.
A state of increased anxious activity, typically induced by an amphetamine.
Yo, that seventh cup of coffee's really got you pinging off the walls, dude.
pinging by Mutant June 10, 2004