Alternative form of まっす (-massu)

To meet with; To encounter by chance; To come across (unfavorably) / To encounter a bad experience. / To have an accident

That was unexpected. I didn't see that coming.

understood!

a black marlin

beluga whale; white whale (Delphinapterus leucas)

the neck, neckline, or collar of an article of clothing

bottleneck (a narrow portion of a road or a slow part of a process that obstructs or impedes overall traffic or processing)

souvenir, memento

(idiomatic) to get along (with someone)