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1.
1) A form of whammying on guitar hero known to get the most amount of points quickly by alternating between no whammy and fully whammy in the quickest amount of time.

2) A euphemism for tearful masterbation.
1) 'Dude, you got so many points, you must have been dan-whammying!'

2)

Person A: 'Dude, why the fuck are you crying and ejaculating on yourself?'
Person B: 'Oh, i've been Dan-Whammying.'
by MattDutton February 04, 2012