Technically used (obviously) for using Portals in a clever way, However this phrase may be used to describe thinking out of the box in general, or a replacement for that phrase. So basically it functions as a synonym for Thinking out of the box. Often used as "Now you're thinking with portals!" etc.
Guy1:"what you doin bob?"
Bob: "Just Thinking with portals"
Guy3: Maybe we can do (something really awesome and original that I can't think of right now)
Guy4: Now your Thinking with Portals!!
Friction Portals occur from having sex without lube in such a manner that friction builds up to a point in which the space time continuum breaks and/or rips, forming a Friction Portal to another time or dimension.
Side-effects include: pregnancy, Drowsiness, Dizziness, Herpes, and Friction Portals.
Ingress term
To rent a portal is to go into an oppositefactions area & use a virus to flip it. The opposing faction can always flip back after an hour to regain control. This is is usually done to level 8 portals.