یادم رفت

Question

پاک یادم رفت

Answer 1

clean forgot (=completely forgot)
▪ Sorry, I clean forgot your birthday.

Longman Dictionary of Contemporary English  

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4. Informal Entirely; wholly: clean forgot the appointment.

http://www.thefreedictionary.com/clean

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clean forget American English (=completely forget)

He meant to invite Monica, but he clean forgot.

http://www.ldoceonline.com/dictionary/forget

Answer 2

I forgot all about it!
 

Answer 3

I completely forgot.

Answer 4

It slipped my mind.