Slightly Vulgar Funny Tees

What a teeWas shopping around Ang Mo Kio Hub and saw this set of tees. Thought I share it with the world. Can you guess its vulgar meaning?

*Hint: look at the animals in the picture and say it aloud what the animals are.

hehe.. i didnt get it when i saw it with you!!!! now i do!!! hehehe…!