2. (n) type of material that spews forth from volcanoes at a moment's notice...or daily if you're kilauea.
lava is hot, and it rocks. (duh)
II. Something you can't touch:
a. For a children's game
b. Due to uncleanliness or the threat of seminal fluid
"Hey, don't sit on that bed. Jessa and Charlie share that bed. It is soooo lava."