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1.
to be off your face entirely, namely drunk/high/fucked.
last night i was so twanged i thought my sister was hot.
by incriminator-c February 04, 2006
 
2.
the past tense of the verb to twangmeaning to give it someone sexually
'i twanged her good last night!'
'i twanged that bird from the bar'
'i gave her a good hard twanging'
by shpannah September 07, 2006
 
3.
Twanged / twanging / Twangage - The art of discretely unclipping a females bra with the click of your finger and thumb in one swift move to create a look of panic on the recipient of the twang. This tends to work best on an attractive work colleague at Christmas parties etc.
I cant believe you twanged me at the party
by SecretSanta2011 December 21, 2011