1.Noun: The point at which
the tip of the penis enters the vagina.
2.Verb: The act of putting the tip of the penis into the vagina.
3.
The promise you make during
3rd base.
i.e. " I'll only put the tip in."
"
Stacey, baby,I don't think we are ready to have sex either, I just want to
tip in, and then I'll pull away,
that's all. Promise"