(colloquial) Clipping of 意味深長 (imishinchō).

background

to include, to put into / to load a weapon / to do with all of one's heart, to enthusiastically

意味: a meaning, a significance, the point / 異味: strange or different flavor

a meaning; a significance; a point / meaning; definition

to mean, signify, imply

deep, profound

picture, painting, drawing, sketch

deep, close, thick, profound

deep, profound