1. Extremely drunk. The old man, tight as a tick, stumbled into the building claiming to be a prophet from the future. Sorry about last night, my dad was as tight as a tick by the end of dinner.

2. Extremely close together; at or near an equal level; neck and neck. Usually said of competitors in a race or competition. The two athletes have been tight as a tick for this entire race. The election is as tight as a tick so far. We're going to have to wait until the very last votes are tallied before we know a definitive winner.