EXCLUSIVE

"Half Baked" star Jim Breuer's ex-neighbor is now facing felony stalking charges -- after allegedly mailing a box of condoms to the actor's Jersey house ... in a perverted joke involving Jim's underage daughters.

Sources close to Jim tell TMZ, the actor's been having problems with Giuseppe Ionfrida for a couple years ... but it got particularly twisted back in December.

We're told Ionfrida allegedly left extremely creepy comments on a YouTube video about Jim, such as ... "How's your three pretty daughters doing ;)" Days later, Jim claims Ionfrida shipped him a box of condoms.

We're told Jim called police in early January, and Ionfrida was arrested on felony stalking charges.

We spoke to Ionfrida who told us he denies leaving the YouTube comments about Jim and his daughters. He did say he doesn't like his kids hanging around Jim -- which is an issue since their kids are friends.

We reached out to Breuer ... he had no comment.