The term 'WEE LITTLE GUY' can be broken down into three parts: 'LAD', a 3-letter word, 'WEE', and 'LITTLE GUY'. The word 'LAD' is a noun that refers to a young man or boy. The word 'WEE' is an adjective that means very small or tiny. Finally, the phrase 'LITTLE GUY' is a colloquialism that is used to refer to someone who is small in stature. Together, these three words form a phrase that describes a young man or boy who is very small in size.