A man who shoots his load before you even realise he was excited. Can also be called a phantom, and can be used in conversation as phantom spunked.
'He's such a phantom spunker, whenever he see's a pair of tits he shoots his load'

'He phantom spunked as soon as we got in the taxi'

'One look at the milf next door and he phantom spunked in his pants''

'As soon as i saw that fit bird i did a phantom and had to go to the gents to clean up'
by Debradelish January 15, 2010
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