By analogy with spoog, the earlier strong past tense of spuwen, from Middle Dutch spuwen, from Old Dutch *spīwan, *spiuwan, from Proto-Germanic *spīwaną. The older strong past was formed in Middle Dutch by analogy by other strong verbs with -uwen.
Inflection of spugen (weak)
|present tense||past tense|
|1st person singular||spuug||spuugde|
|2nd person singular||spuugt||spuugde|
|2nd person sing. (gij)||spuugt||spuugde|
|3rd person singular||spuugt||spuugde|