The inevitable state attained when a normally skilled guitar player loses said skill after over-imbibing in alcohol and/or other narcotics, and can no longer play a normally easy song or riff
Note: normally this is used only by the guitar player him/herself, as those in the vicinity are likely also too inebriated to notice the guitardedness
1)Fuck! I'm guitarded. 2)I'll play you this song unless I'm already too guitarded.