I managed to do this
Level: Splinter's Manufactoring
To talk to a slig as a glukkon heres what you need to do:
enter the room in splinters where all the sligs are.
kill all of them except for two
make sure you leave 1 Gun Slig and 1 Bouncer Slig alive (holding a bat)
Possess the gun Slig and shoot the bouncer slig once to get him to chase you. try luring him to the office and switch back to Abe. -Make sure the bouncer Slig is close by the glukkon-
use abe to possess the Glukkon and have a "Nice" conversation with the Slig
TRIVIA:
1)when possessing a Glukkon and talking to a slig. he takes whatever you say as a insult and will try to attack you
example:
Glukkon: Everybody loves me!
Slig: P*** OFF!
*battle music plays*
2) The Glukkon is unkillable. no matter how many times you shoot him, he will have Full Health
3) The Glukkon will ignore you if you talk to him as the Slig