What is Thumb Print?
1.
a way of taking A LOT of acid. the 'cid is dissolved into a greasy substance at high concentration, and stored in a lip balm container. to dose, stick your thumb in, smear out enough to coat it, and lick it off. depending on the quality of the stuff and how much you scoop out, it seems to be the equivalent of anywhere from 5 to 20 blotter hits.
the first time you do acid, don't do a thumb print. you should work up to that dose in a few sessions with experienced friends.