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Wiktionary
ampallang

n. A male genital piercing in which a barbell passes through the head of the penis horizontally. Can be transurethral or placed above the urethra based on piercer and piercee desire.

Wikipedia
Ampallang

The ampallang is a male genital piercing that penetrates horizontally through the entire glans of the penis. The piercing may be transurethral (passing through the urethra). A variant on this piercing is the shaft ampallang, which penetrates the shaft of the penis horizontally at any point along its length. The counterpart to this piercing is the apadravya, which penetrates the glans vertically. The combination of an ampallang and an apadravya is sometimes referred to as the magic cross.

This is an advanced piercing, and the procedure can be extremely painful. Full healing usually takes between four and six months, but can take a year or more.

This piercing, once healed, is often pleasurable to the bearer because it stimulates the internal penis tissues.