This is a shortened expression of "having a time" -- So, the act of experiencing any situation--in any context-- mildly or intensely, good or bad.
"Hey, how's it going over there?"
"I'm havin' one."
"See that guy over there, passed out with his sunglasses on and a beer in his hand?"
"Oh yeah. He's definitely havin' one."
"I can't talk right now because shit totally just hit the fan, I'll call you when I'm not havin' one."
"This bar is a little weird, and these people are creeping me out... but I'm still havin' one."
downing one means drinking some spirits and getting durnk, used in dublin ireland.
used mostly by knackers (chavs)
that pic is of me fuckin downing one
The situation resulting from using a sock when no toilet paper is available.
Dear Mom,
Went to Tijuana and ate shitty tacos. Tried to drive back to Barstow in one sitting. I'm now one sockin' it. Please send more socks.
-George
When he or she intends to get a packet of Peruvian snow delivered.
James said to the boys, shall we get one in?
Someone who has the qualities of selflessness, Honesty, Peacefulness, Bravery, and Intelligence.
Nicole is such a divergent one
On your ones. To be by yourself when no ones around
"don't make me catch you slipping on your ones.
"If I catch you lacking on your ones your catching it"
A turd that gets stuck on the dry part of the toilet bowl.
Mike: Why were you flushing so much? Did you just beach one?