Tyga Raps about Penetrating Kylie Jenner?

'$TIMULATED'SoundCloud

Tyga's got the blueprint ... brag about having sex with your juuust 18-year-old GF Kylie Jenner -- and everyone will pay attention to your new music.

Tyga just dropped a new mixtape, which includes the song, "Stimulated" -- which includes lyrics like: "They say she young ... I shoulda waited ... She a big girl, dawg ... When she stimulated."

There's more ... like a direct reference to "penetration." The "young" line makes it seem like Tyga's talking about Kylie, but who knows?

After he dropped "Pleazer" -- the one where he rapped about "vagina juice" -- he insisted the track was NOT about Kylie, but some other random chick.

Read more: http://www.tmz.com/2015/08/24/tyga-song-stimulated-sex-with-kylie-jenner/#ixzz3jnqN8Rxi