and describes the little visible bulge from a nipple of a female
breast under the clothes.
Cause it looks like a hedgehog (Igel) is pressing his nose (-nase)
against the clothing and making a bulge, the Igelnase.
Pronunciation is like "eagle-nah-zen"
Jack: "Igel... what... eh?"
Joe: "You see the nipple under her shirt?"
Jack: "Sure, I do"
Joe: "Well, that looks like a hedgehognose or German Igelnase"