1. The man's erect penis rapidly thrusting back and forth in the woman's vagina (or an anus).
2. The woman's vagina (or an anus)rubbing up and down on the man's erect penis.
3. The action of the penis penetrating an object or a person.
4. An insertion of the vagina that is pleasing to the woman.
"oh,i gave your mom a "thank you in the 90's"all night"-other dude
"fuck you"-random guy