Trucker's Spa 

One of those establishments by the side of the interstate that acts like a massage "spa" but has a big sign saying "Truckers Welcome!" and is actually a low rent whorehouse. They may have names like Jade of India or Oasis, but they typically are corrugated roof shacks with a "masseuse" pushing sixty and holding on to her last three teeth. You would have to drive a big rig for four day straight to make these women look good.

"what is a classy spa doing out here in the middle of nowhere?" Pal, that isn't an actual spa, it's just a Trucker's Spa; you may get a handjob and a dirty towel for 50 bucks"

Trucker's Spa by Irish Mike 2006 October 25, 2007

Gentleman's Spa Day 

It is the act of pampering oneself in a specific way. The usual three "S's" (shit, shower, shave) but with a few things added in. First is masturbating, preferably before entering the shower. While showering ensure you have a can of your favourite beer (if you are a risk taker feel free to have beverages in glass containers) and put on some music (ZZ Top comes to mind). Voilà, a pampered gentleman.

Friend: What did you do this weekend?
You: Well I stayed in on Sunday and had a Gentleman's Spa Day
Friend: Nice

Gentleman's Spa Day by Katoxxvi September 11, 2016

That's Spa 

an alternative to "that's hot", Means whatever you're referring to is hot, luxurious, glamourous, expensive.

Honey you need to get it; that's spa.

or

Your mother died in an epileptic car crash induced by her drug use and alcoholism?

That's spa

That's Spa by Matt*hew June 30, 2008

Captain’s Spa Day

To listen to loud music while drinking alcohol in the shower.

“After a long day, I like to grab a six pack of Smirnoff Ice, blast some TOOL, and have a Captain’s Spa Day.

Captain’s Spa Day by StogieBoi September 13, 2020

Claire's Luxurious Cafe and Spa 

A cafe that was built by blossomglowaj and agatha0926 for Roblox. A small, but great place to hangout and enjoy time, with great snacks and breakfast meals.

Oh dang, did you hear about Claire's Luxurious Cafe and Spa? Really good though.

Claire's Luxurious Cafe and Spa by agatha0926 November 27, 2017

State funded, minimalist spa (SFMA)

Prison
–noun 1. a building for the confinement of persons held while awaiting trial, persons sentenced after conviction, etc.
2. state prison.
3. any place of confinement or involuntary restraint.

“As a result of the Extended Unauthorized Holiday in KISD, Billy was treated to a long stay at the SFMA.”

"Martha Stewart was well rested after her visit to the State funded, minimalist spa (SFMA)"

State funded, minimalist spa (SFMA) by Katy Proper December 30, 2008

spa science 

Knowledge or a system of knowledge covering improbable results of spa treatments or the operation of spa logic especially as fabricated for sales purposes and concerned with bodily appearance and sense pleasures.

Electric detox body wrap for weight loss? Sounds like spa science to me!

spa science by Bottom Ford June 8, 2009