Lorax 'I let it grow' Innuendo

Okay listen up, buttercup. This meme uses the Lorax, right? In his movie, he says 'I let it grow' about planting a tree. But here, the joke changes 'it' to mean something... well, something else entirely when a person sees a 'fem boy'. The Lorax's shocked face makes it funny, like he can't believe the words coming out of his mouth. Now go get a life, you're welcome.