Y

yatter
To yatter or yatter on is to talk or chatter, usually incessantly.
I could hear them yatterin away, but didn't pay any attention to what they were saying.
...What's he yatterin on about now?
The word is onomatopoetic.

ye
Ye means you.

yellow-yite
A yellow-yite is a yellowhammer.

yestreen (pronounced yes-treen)
Yestreen means last night, or sometimes, more loosely, yesterday.
It was gey wet yestreen.
The term is a contraction of yester-, as in yesterday, plus even, as in evening.

yett
A yett is a gate.
The prison yett
...as daft as a yett on a windy day
In place names such as the Yetts o Muckhart, a yett is a pass running between hills. yett is an Old English variant of gate.

yeukie (pronounced yuck-ee)
Something, such as a part of the body, that is yeukie, is itchy. The word comes from the Middle Dutch jeuken to itch, which is ultimately from the same Germanic origin as "itch".

yin
Yin is a word meaning one. It is more widespread in its distribution than either ane or wan, being used in most of Scotland with the exception of the North.
Let's see the ither yin again.
...yin o life's great mysteries
...Youse yins will have tae wait.

yird
Yird is a Scots word for Earth

yirdit
Yirdit is a Northeastern word meaning dirty.

yite or yitie
See yellow-yite.

yoke
To yoke or yoke to is to start work for the day (or shift).
Are you no yokit yet?
This now chiefly Northeastern term alludes to a horse being yoked up to a plough.

yokie (pronounced yoke-ee)
A Northeastern form of yeukie.

yokin time
Yokin time is a now chiefly Northeastern way of referring to the time when a period of work starts.
He was still in his bed come yokin time.

yon
Yon means that or those.
Whit has yon bunch o wasters ever done for us?
...one of yon fancy foreign lagers
Yon can also mean that one or those ones.
Yon's a fool.

yon time
In the Glasgow area, yon time is a way of referring to any unspecified but very late time.
If we miss this bus we'll not be home till yon time.

youse or yous (pronounced use or yiz)
Youse is a form of you sometimes used in Central Scotland when addressing or referring to more than one person.
I know youse two are lesbians.
...It's the moment yous have all been waitin for
In very broad Scots it is sometimes also used as a singular.
if youse were a decent Presbyterian