Back to school for uppity chairman? OMG – that’s hilarious! (7)

I believe the answer is:

roflmao

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'omg that's hilarious' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'back to school for uppity chairman?' is the wordplay.
'back to' says to take the final letters.
'uppity' says the letters should be written in reverse.
'chairman?' becomes 'Mao' (Chinese leader Chairman Mao).
The last letter of 'school' is 'l'.
'l'+'for'='lfor'
'lfor' reversed gives 'rofl'.
'rofl'+'mao'='ROFLMAO'

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I've seen this clue in the Sydney Morning Herald.

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