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A term used in a tight group of friends where if you ask a question your friend can reply with higoo to make sure it is true. If the statement your friend has said is a lie, they must reply with higii.
Higoo is almost like promise, but stronger and more trustworthy.
Friend 1. "I fucked three girls yesterday"

friend 2. "higoo."
friend 1."higii"

Higii is said because the situation that friend 1 is in, is a lie.

Situation 2.
friend 1. "I won £100 last week."
friend 2. "higoo."
friend 1. "higoo."
Higoo was said in this situation because friend 1 was telling the truth.
by Bennyboy01 February 09, 2017
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