noun
Colloquial, slightly childish or informal word for the very tip or end of something long and thin, like a pencil, finger, or stick. Often used in everyday speech.
鉛筆の先っちょが折れちゃった。
The tip of the pencil broke.
指の先っちょにトゲが刺さった。
I got a splinter in the tip of my finger.
Standard word for tip, end, or ahead. 先っちょ is more colloquial and emphasizes the very extremity.
Formal or technical term for tip or leading edge. 先っちょ is casual and used in daily conversation.
Formed from 先 (さき, tip) with the colloquial suffix っちょ, which adds a casual, diminutive, or slightly childish nuance. The exact origin of っちょ is uncertain, but it appears in several informal words.