A verbal 'beat down' of Biblical proportions... real Old Testament-style. To unleash an epic lingual assault.
Origin of this word is believed to be from Vietnam-era GI slang.
David stepped out of line again, so I had to lay down the Scunyun on him.
Sometimes it is used in conjunction with the word 'can'. Davey rolled in with his typical BS so I had no choice but to open up a Can of Scunyun on the bastid.