绑票 is a v.o. (verb-object separable compound). The verb 绑 means 'to bind', and 票 represents 'ransom' or 'a kidnapped person'. It means 'to kidnap someone for ransom'. As a separable verb, you can insert aspect markers (了, 过) or measure words between the two syllables: 绑了票, 绑过两次票. You cannot directly attach an object after it; instead use 把 or 被 constructions, or mention the victim with 对 or 跟. This word is strong and informal, mostly used in crime contexts.