PLUG: The American Sign Language (ASL) sign for "plug"
PLUG can also mean CHARGE / CHARGE WITH / IMPEACH / IMPEACHMENT

To do the sign for "plug" hold up your non-dominant index finger and then use your dominant-"V"-hand as a plug. (Don't move the non-dominant hand -- just move the dominant hand.)
 

PLUG / PLUG-IN

But wait! There's more!  Reverse the movement and you've got....unplug!!!

UNPLUG:

(Oooh. Tricky eh?  Please, hold all applause till the end. If you missed it, just refresh the page.)

UNPLUG computer:

PLUG computer:

INSERT-[insert-usb/insert-cable/plug-in-a-peripheral]:

INSERT-[insert-usb/insert-cable/plug-in-a-peripheral]-[version]:

rechargeable [AGAIN PLUG-in CAN] [V/1 hand version]:

Sample sentence: I NEED charge-[PLUG-in] MY PHONE

Notes: 

See: CONNECT
BATTERY
INSERT
COMPUTER
PHONE