Meaning of tōu tōu:
偷偷
stealthily; secretly; covertly; furtively; on the sly
Tā tōu tōu bǎ yào shi fàng huí le zhuō zi shàng.
他偷偷把钥匙放回了桌子上。
He stealthily put the key back on the table.
Tā tōu tōu de liū chū jiā mén.
他偷偷地溜出家门。
He secretly snuck out of the house.
Tā tōutōu de líkāi le fángjiān.
他偷偷地离开了房间。
He covertly left the room.
Tā tōu tōu de líkāi le fángjiān.
他偷偷地离开了房间。
He left the room furtively.
Xiǎo māo tōu tōu liū chū le jiā.
小猫偷偷溜出了家。
The kitten sneaked out of the house on the sly.