found it

code/game/atoms_movable.dm

@@ -55,6 +55,9 @@
 	///Internal holder for emissive blocker object, do not use directly use blocks_emissive
 	var/atom/movable/emissive_blocker/em_block
 
+	/// Should we use tooltips, if the thing does not have the code implemented `get_tooltip_data()`, it will default to examine(src)
+	var/tooltips = FALSE
+
 
 /atom/movable/Initialize(mapload)
 	. = ..()

code/modules/tooltip/tooltip.dm

@@ -122,9 +122,6 @@ Notes:
 		if(user.client && user.client.tooltips)
 			user.client.tooltips.hide()
 
-/atom/movable
-	var/tooltips = FALSE
-
 /atom/movable/proc/get_tooltip_data()
 	return