Pi, (the mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter,) is playfully used to refer to 3.14 or March 14th as a day to celebrate creampies.
A creampie (also known as internal ejaculation, and often in same-sex contexts as breeding) is a sexual act featured in hardcore pornography in which a man ejaculates inside his partner's vagina (or anus) without the use of a condom, resulting in visible seeping or dripping of semen from the orifice.
Of course, this is a form of unprotected sex, increasing the risk of pregnancy in women and sexually transmitted infections (STIs) such as HIV. The risk of STIs is markedly increased in anal ejaculations. Play safe.
