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It stands for... sit on his/her face. To sit on another persons face so that can perform oral sex.
Hey girl, did Jason let you SOHF last night?
by Hermiechick October 04, 2009
sense of humour failure
'i found it funny'
'so did i'
'it was terrible'
'whats wrong with you sohf'
by jaymz1976 December 18, 2007