Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

(n)A word made by combining two other words to form a new, truncated single word. Tword is an autonym (a word that describes itself) as it is made by combining the two words, ‘two’ and ‘word’.

Examples of twords include cankles (calf/ankles) and moobs (man boobs). Recent years have seen the rise of twords to describe celebrity couples, including Brangelina, and Tomkat. For many years, marketeers have delighted in their creation to describe products or market segments, for example infomercial and edutainment.

T-word is tickle in the tickle community, most lees will say it because they get really flustered saying it

(n)A word made by combining two other words to form a new, truncated single word. Tword is an autonym (a word that describes itself) as it is itself made by combining the two words, two and word.

Meaning "Taiwan" to pissed off chinese people whenever you are in a argument or in a trash talking session
People use T word to make chinese mad