Could it be honking? Is your rabbit still intact? Is your rabbit circling you?
Young intact males may start to honk and run around you when their puberty and hormones are kicking in. It means they’re “attracted” to you.
If he’s still intact, I’d start to call the vet for a neuter. It’s very important to spay/neuter rabbits, because hormones can lead to behaviour problems and certain cancers. Male rabbits can start to spray urine, circle around people, display aggression and constantly trying to mount people, other pets and hosuehold objects. The phrase “At it like rabbits” is aptly named, because a hormonal rabbit has only 1 thing on his mind. It can make rabbits extremely frustrated and difficult to have around.
Our Breintje was unneutered until he was 2 because my BF had heard a lot of ghost stories about rabbits dying during the procedure. He also never displayed any of the hormonal symptoms. But as soon as Breintje moved in with me, he started to notice that I am a female. He started to hump every soft object in sight and became very grumpy and agitated. We decided to go through with the procedure, and it went really well. We have a much happier and healthier rabbit now.