PLEASE NOTE THAT: here, I didn't use the word, Imagery, but thats' basically what it means.
For instance, a member of the group may divulge certain graphic details of a sexual encounter. This can often lead to a dumbfounded silence in which the group will try to shrug off the lurid fantasies and visions.
At this point, someone must interject with a well-timed '...imagery'. This dispels any tension that may have gathered, and allows the group to laugh it off, before regaining their previous banter form.
It is at this point that i must point out that this word cannot be used by females, as their grasp on banter and comic timing are dreadful.
The word imagery must be articulated with 4 syllables, and must be said slowly and with a sarcastic intonation : im-ag-er-y.
This word can also be used in conjunction with a joke that has been taken too far :