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 game giving away our position.
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.