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A 'fourthy' is a partial erection. One might be apt to call it a half-boner, but this would be technically incorrect as a 'fourthy' occurs when a penis is more than 1/4th of the way up...hence, a fourthy.

It should be noted that fourthies (plural form) are apt to occur at inopportune times (such as in public places) and as such are typically surpressed to prevent a complete erection.

If a complete erection does take place, it would be said that 'he has a boner', not a 'fourthy'.

In most cases fourthies are largely unsightly however exceptions are known to occur.
OMG that milf gave me such a fourthy.

Joey's such a pussy, when she kissed him on the cheek he got a fourthy.
fourthy by tmkly3 October 30, 2007
Related Words
If your mouth is clean, i can fulthy it up.
Fulthy by K to the I M February 4, 2009
A insult used to describe a member of a 3 person squad (typically Battle Royale type games) that is so bad they are hurting their squad and helping the enemies win. Almost as if they were a fourth member of a enemy squad.
Just had a match with a fourthy that threw the game giving away our position.
Fourthy by Indirectllama March 25, 2021
Cigarette: Northern slang for a cigarette, used oft by mashed up mancunian ravers becasue of the resemblance of a hot(electric)stove to the end of a lit cigarette. Originated circa 1991 in the early halcyon days of the rave culture; we speculate during a drug fuelled hallucination by said manc.
'fuck me noel, i am bolloxed, is that a ciggy in your mouth, or the stove from me 'nans kitchen'/
General use: 'Give us a stove you cunt'
stove by anthony willison March 18, 2004
Word of the Day on August 4, 2026

Walky-Talky 

A derogatory term for able bodied people or people that can walk. This definition was coined by disabled influencer Valerie Weber
Person in wheelchair: “look at that walky-talky over there.”

Friend in wheelchair: *looking at person who is walking* “yeah haha
Walky-Talky by odd muffin October 5, 2021
Word of the Day on August 3, 2026

Scrapnel 

(N) :
All pieces left over after an art project or home improvement.
"After we made the decorations for the party, there was 'scrapnel' all over the floor"
Scrapnel by IceSniper February 22, 2025
Word of the Day on August 2, 2026