The act of having unprotected sex with one partner and then, without showering, having unprotected sex with a different partner, thus transferring the residue, juices, and secretions between the two parties either with or without their knowledge.

During vaginal intercourse, the penis is inserted into a woman's ass and then inserted back into her vagina; therefore, the penis takes the shit from her ass and gets it into her vagina.

When you introduce a friend from one group to a friend from another group, and they become autonomous friends, no longing requiring your services to hang out. Not necessarily a bad thing, but can be disastrous if left unchecked.

When picking your nose, you pick the left nostril, then you pick the right nostril (with the same finger), transferring a booger from one nostril to the other.

To expell flatulence directly onto the skin or clothing of another person.

When you introduce a friend from one group to a friend from another group, and they become autonomous friends, no longing requiring your services to hang out. Not necessarily a bad thing, but can be disastrous if left unchecked.

Figure A and B are brother and sister, or related in some way. Figure A dates or hooks up with Figure C while Figure B goes out or hooks up with figure D. Some time later, Figure C and Figure D hook up as well. This mixing of juices is called Cross Pollination, and is generally looked down upon in a modern day society.