"I was obviously so nervous," he continued. "Like most men, I had, what you would refer to as 'retro-bush.'"
The director went, 'Oh...,' and I went, 'OK, I'll trim it,'" the 40-year-old actor shared. "I went into my trailer ... and I trimmed ... but I overshot a little bit ... and I looked down and I had a little landing strip, lovely little landing strip."
Watch the clip below to here the blush-inducing story.
There was a reason for the candid confession, of course. Farrell told the "narrowing" tale in order to raise money for the CHIME Institute, a charter school in Woodland Hills, California, which provides an inclusive education for children with special needs, who are able to study alongside their non-special needs peers. Farrell revealed that his 13-year-old son, Jack, has attended the school for years.
So at least the hairy situation all led to a good cause!
Watch the video below for the most swoon-worthy Irish actors in Hollywood.