it means to rebel or go against. Typically against one of a higher authority. It can also mean a rebellion.
"dude did you hear about what happened at the school?"
"no what happened?"
"the students just spaffed against the principal after he said cellphones weren't allowed. They launched a school wide protest"
by YERT49576 August 31, 2021
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When you go to the pub and spaff all your dollar
by Sphaff June 18, 2017
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a combo a a spoof and a laugh or a spoof and a gaff
by arty1234 July 14, 2017
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Literally means ejaculate. As to Spaff on someone's face.
Having a wank later, might turn into a spaff.
by David Spy October 27, 2023
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A torch emitting ultra violet (UV) or "black light". Allows the user to see things not necessarily visible to the naked eye.
Where's James?

Oh, he's cheking the bunkhouse out using the spaff torch
by Fatkid_13 October 30, 2021
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Someone who is such a wanker, that they could be considered the president of wankers.
Dean, you’re such a Spaff Master.
by DangerMonk1854 June 1, 2018
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