Hole-in-one? No. 2 in the hole is more like it.

For the past decade, a Norwegian golf course has been dealing with a serial pooper — who decides to leave dirty toilet paper and feces at the bottom of holes.

UPI reported Stavanger Golf Club, a scenic waterside course in Hafrsfjord, claims they have been finding poop in the course’s cups since 2005.

And the worst part is they have no clue who’s been doing it.

“He has a couple favorite holes,” groundskeeper Kenneth Tennfjord told the Rogaland Avis newspaper. “And we know it is a man because the poos are too massive to be from a woman.”

Tennfjord said the mysterious pooper only lays his tracks on weekdays. The club has tried catching the culprit by installing high-powered lights, but to no avail.

“He climbed up a tree next to the lights and wriggled far out on a branch and dismantled the spotlights,” Tennfjord said. “How he managed the feat without electrocuting himself or falling is a riddle.”