purrasite 

The kind of cat that is extremely clingy, always seeking out his/her favorite warm, human host body for cuddling and ridiculously close snuggling to the point of looking attached to said person. This demonstrated behavior and total disregard for personal space is typically accompanied by loud purring, uncomfortable kneading, and possible scratching if the host body dares to desire to move independently.

Chloe: Love the fur boa, girlfriend! Hey, do you hear a lawnmower?

Sonya: Thanks, but it's not a fur boa and that's not a lawnmower either! It's Mittens! She's a real purrasite and damn, she never wants to let go!

purrasite by Furson January 28, 2011

Underwater ‘Parasite’ Cocaine Smuggling

Underwater ‘Parasite’ Cocaine Smuggling — A tactic where gangs use scuba divers to attach cocaine stashes to the hulls of unsuspecting ships.

I make my living as a scuba diver; but, I ain’t no Jacques Cousteau — I’m into Underwater ‘Parasite’ Cocaine Smuggling . It’s dangerous but quite lucrative!!!!!!!

Underwater ‘Parasite’ Cocaine Smuggling by Mind Hunter the Profiler July 28, 2023

Crystal Parasite 

Someone that grows their entire personality off of the lifestyle or personality of someone who is already famous, or some cultural phenomenon, basically anything popular, in a vain attempt to get famous themselves.
For example, any YouTuber that has over 100k subscribers, or maybe even less.
Sometimes this works, but most of the time they just come off as a parasite, leeching off of the success of the person or TV Show or whatever, the "crystal" they "parasite" off of.
Thus they seem instead like talentless hacks with no worth of their own besides what they echo from their "crystal".
Essentially they are a clone of the person, but worse. Much worse.

Person 1: Ugh, that guy's such a crystal parasite, always leeching off of Merg's success.
"that guy": What's up guys, welcome back, to *insert game that Merg's already played here*.

Crystal Parasite by Padria Zozzria May 30, 2020

Wifi Parasite

People that buy a latte to sit in a coffee shop or similar venue for free wifi.

I walked in to a bagel shop for a bagel and noticed a table full of wifi parasites, laptops open, paper and pens out and pure business discussions flowing.

Wifi Parasite by Marcellus_Wallace October 13, 2014

Gift Parasite 

A person who adds their name to a gift tag in order to claim partial credit for giving the gift.

I'm totally broke so I had to be a gift parasite and sign on that present you're giving Grandma.

Gift Parasite by Bird Turggler November 23, 2009

Parasite 

One who leaches off others whilst pretending to be their friend. Once they have their fill they move on to the next victim.

That Slimbo is a real parasite. Waited till his mate got a big payout then he and his mates bled him white then disappeared.

Parasite by Slimbo Kev February 10, 2017

Parasite privilege

Parasite privilege is when elites weaponize identity politics to deflect legitimate criticism or to protect their class privilege.

Sane person: Billionaires are parasites. No single person can create a billion dollars worth of value, their wealth relies on rampant worker exploitation.

Privileged NeoLiberal: What? You’re not allowed to criticize billionaires, that’s anti-Semitic.

Sane person: You’re disingenuously using identity politics to protect the powerful. That's parasite privilege.

Parasite privilege by Wealthy Hobo March 8, 2021