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.
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 gamegiving away our position.
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'