Usage notes: Effing here represents the letter 'F' as a way of avoiding saying 'fuck' or 'fucking'. Blinding comes from an old-fashioned phrase 'Blind me!'
I could hear Bill effing and blinding as he tried to repair the washing machine.
mod. fucking. (Usually objectionable.) What an effing stupid idea! Who is that F-ing idiot.
effing around
and F-ing around
in. fucking around; messing around. (see also fuck around. Usually objectionable.) They were F-ing around with the switch and turned it on accidentally.