noun
Colloquial word for the very tip or end of something, often with a casual, diminutive feel. Used for physical objects like a pencil tip, finger, or branch end.
See also: 先
鉛筆の先っぽが折れちゃった。
The tip of the pencil broke.
指の先っぽが冷たい。
The tips of my fingers are cold.
先 is the standard, neutral word for tip, end, or ahead. 先っぽ is a colloquial, diminutive version that emphasizes the very extremity.
Formed from 先 (さき, tip) + the colloquial diminutive suffix っぽ, which adds a casual, slightly childish or intimate nuance.