It means scaring, it causes fear or terror. Terrifying, terrifying, threatening. It's a way to call a dangerous gangster or street thug. In Caracas there is a group of gang members with that name. In Colombia we use the term "tuki-tuki" or better "tuki-tuki Lulu", (and we say it pointing with our hand the neck), to mean misfortune, problem, fatality, misfortune, calamity, adversity, misery, tribulation.
