When you just fucking randomly and spontaneously get really happy for a few seconds?
I like it, it's like a less powerful orgasm for my entire body.
I call it 'chemical changes in teenagers' psyduck;
I call it "OMGWTFBBQ SUPERSAYIAN 4" LUL china;
Either:
1. You had a nasty energy drink that slowly poisons your body.
2. You, my friend, have just experienced puberty.
Sexual Euphoria?