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The time at which an ingested substance is at its highest possible concentration in the bloodstream. Used colloquially in the context of recreational drugs, most commonly psychedelics. When peaking, a psychedelic trip is usually at its most intense/powerful. The nature and duration of a peak varies by drug, user, and mindset at the time of tripping. Contrary to what some may say, it is not a term specific to any one particular drug.
Tripper A: "Dude... I..."
Tripper B: "What, man?"
Tripper A: "I'm... it's... lattitude."
Tripper B: "He's peaking hard."
Peaking by sno0ks December 3, 2011
Euphoric feeling literally an overwhelming sensation of emotions usually good ones.
"Bro CB is peaking right now on the 7 grams of shrooms he took." - People Reading CB's FB posts
Peaking by Alt420 July 3, 2020
An act imitating orgasm or climax in response to another action.
"I'm peaking", I said after Jason introduced us to his older brother, Michael.
Peaking by jeongu1004 October 29, 2020
the result of ingesting copious amounts of MDMA.Deffinately the more social of drugs , MDMA can make the most shy annoying people seem interesting.. ofcourse only to other people peaking.Effects include a sensation of "floating" , as though you weigh nothing and your legs seem to glide rather than stride.Thus being able to dance hours on end.Everyone talks to you and you talk to anyone about anything and somehow it all seems to be the most indepth conversation about cornflakes you have ever had and it is sure to change the rest of your life
Man THOSE YELLOW DOVES ARE FUCKING AWESOME IM PEAKING OFF MY HEAD MAN WHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO LETS DANCE *DOOF DOOF DOOF DOOF DOOF DOOF DOOF*
PEAKING by AIDAN March 5, 2005
the most intense part of an LSD trip, usually lasting for about an hour, in which "ordinary reality" becomes interwoven with the private pschedelic perceptions of the tripper.
"If you think this is weird now, wait 'til we start PEAKING!"

Note: applies only during the use of LSD; not psilocybin, MDMA, or other hallucinogens
peaking by mainframe October 31, 2003
When you are about to poop and the head of the poop appears to be coming out of the butt.
Man i need to use the washroom I'm peaking
Peaking by GyroDingo January 20, 2015