soap-box (spbks)

n.
A carton in which soap is packed.
A temporary platform used while making an impromptu or nonofficial public speech.


intr.v.
Informal soap-boxed, soap-box-ing, soap-box-es
To engage in impromptu or nonofficial public speaking, often flamboyantly.



Idiom:
on (one's) soapbox
Speaking one's views passionately or self-importantly.