both a noun (someone who isn't a fully grown geek but half way there) and a verb (describing a geekish activity, but one that wouldn't put muggles {= non-geeks} off)
1. I'll introduce you to all my geek friends and in a few weeks you'll be a geekling yourself
2. Q: The weather was fabulous all weekend, we spend all of Sunday on the beach... and you? A: *mumbled* err.. I was just geekling about ...
geeking on that water is slang for saying that your drinking water that has had a molly or several dissolved into it. Molly is a pure form of MDMA gets you high as FUCK and the word geeking is a term for excitement .
this word is being defined in the song " drunk in love " by The Weeknd where he says " I've been popping, I've been rolling , since I was 17 I've been geeking on that water "