They steal bugs from Timon and Pumbaa after encountering them and say that their philosophy is Kahuna Potato (which means that they will never leave Timon and Pumbaa alone), before giving the duo wedgies.
Later in the episode, after getting trained by Rafiki, Timon and Pumbaa confront Pimon and Tumbaa while they are picking on a squirrel. During the fight, Pimon and Tumbaa trick the duo into thinking that they are hurt, before giving them wedgies again.
Rafiki arrives and encourages Timon and Pumbaa to use Hakuna Matata to win the fight. The duo use their own skills to finally defeat Pimon and Tumbaa, before later forcing them to feed them bugs as punishment.
Pimon and Tumbaa steal bugs from Timon and Pumbaa
Pimon and Tumbaa give Timon and Pumbaa wedgies
Pimon and Tumbaa prepare to fight Timon and Pumbaa
Pimon and Tumbaa defeated by The Fart of Fury
A defeated Pimon and Tumbaa feed Timon and Pumbaa bugs