As verbs the difference between slipped and plipped
is that slipped is past tense of slip while plipped is past tense of plip.
As an adjective slipped
is (of a plant) With part of the stalk displayed.
slipped
English
Adjective
(head)
(heraldry) (of a plant) With part of the stalk displayed.
Verb
(head)
(slip)
plipped
English
Verb
(head)
(plip)
Plip
English
Noun
(
en noun)
A locking system for motor vehicles that uses a small, hand-held remote control
References
* OED 2006 online