裤裆里长棵草裤裆里长朵花
[kù dāng lĭ zhăng kē căo kù dāng lĭ zhăng duŏ huā]
This username uses humor or absurdity for its effect. A grass growing inside someone's pants would naturally be awkward and silly. This could possibly represent that someone is eccentric, unorthodox or likes to think outside the box.