This is a very obscure Tagalog word.
KAHULUGAN SA TAGALOG
sapóng: pagtatagpô
sapóng: pagkikíta ng dalawang tao, sinadya man o hindi sinasadya
Unrelated to the above, the word sapong in Tagalog literary texts is a conjugation of the word sapò (to guild with red ocher).
In old Spanish-Tagalog dictionaries, sapo is defined as tierra colorada, con que dan color al oro.
Yaong bagong sapo ng guintong dalisay…
Guintong bagong sapo ang nakakatulad kristal manding linaw ang pamamanaag…
Makinis ang balat at anaki’y burok,
pilik-matang kilay mistulang balantok,
bagong sapong ginto ang kulay ng buhok,
sangkap ng kataway pawang magkaayos.
The man had newly tinted blonde hair. The tint was likely red. Basically, he had reddish-blond hair.