Adjective. Often means unpalatably thick. Too thick to enjoy. Some people would say "glucky", but that's gross.
Jacob: Hey Mark, I walked past your room last night. I heard someone choking. Was there an intruder?
Mark: Yeah, Jake. Cindy thought she could handle it this time.
Jacob: Oh! So she couldn't handle the gluckular Bo staff?
Mark: I swear, girls these days are built different. Only you've been able to take it so far.
Jacob: Speaking of, can I get in on that once more?
Mark: Fuck off, man! I told you, I'm not doing gay shit anymore.