Example 1: "I didn't do anything on Sunday; I just faffed around the house."

Example 2:
Person 1: "I can't decided between these 2 jackets to wear to the movies. Which one? Where is my black hat? Oh wait, let me get my phone. Do you know where I put it? Oh and did you feed the cat dinner? Maybe I can just check email really quick right now; we have time."
Person 2: "Stop your faffing. We have to leave now or we won't make it."

Example 3:
"He faffed around on the internet for so long that he was almost an hour late meeting us at the bar."

"I had a lot of cartoon characters that used to get me sexually aroused as a kid... The female reindeer from the Rudolph claymation series, when I was in preschool, I used to be bricked up watching that shit." -Jack Harlow

I've been faffing about all day with my car

Stop faffing and get down here, we haven't got all day.

He spends most of his day faffing, eating and sleeping. Nothing particularly useful.

"We were supposed to be there an hour ago but with all the 'faffing' we were late."

Nice faff you got there.

or

Stop faffing about on that car/faff.

Suck her faff