Chanta = Terminal in every meld (Mixed Outside hand?)
Hon Itsu = hand made of only 1 suit and word tiles
Hon Rou Tou = Toi Toi Ho Chanta, i.e. you only have 1′s, 9′s and Word tiles

Ah well, since you seem to like going for those stupidly impossible Yakuman hands, here’s some (er, again using Japanese names):

Su An Ko – form 4 concealed 3-of-kinds, then wait on a single tile
Chuuren Poto – with a single suit, form: 1112345678999 and have any 1 extra tile of the same suit
Chin Rou Tou – you only have 1′s and 9′s in your hand
Tsu I Sou – you only have Word tiles in your hand
Dai Su Shi – you have melds of all the Wind tiles (EEE SSS WWW NNN). Alternatively, having one of the winds as your pair is also a Yakuman (called “Shou Su Shi”)

So, when someone has declared Pon on 2 of the 3 dragons, you should watch out for Tsu I Sou as well as Dai/Shou San Gen. Even without those, calling 2 Pons on Word tiles means it’s easy to form Chanta & Hon Itsu or Toi Toi & Hon Itsu, as well as spamming away at Dora tiles (well… this is only applicable if Red tiles are in play).

Strip mahjong… well, a man can dream, at least. At the rate games I’ve been in have been going, though, it’d take an hour for a girl to take off her socks. :(

Rin Shan Kai Hou (winning off the dead wall tile after declaring a Kan)
Hon Itsu (one suit)
Toi Toi (only 3-of-kinds)
Yaku Hai x2 (Round wind & Hatsu)
Dora 9

East 3-1:

Psi: Hmm… well I guess you had a good Toi Toi going so you could afford to declare those Kans
Ruka: Yeah
Psi: San An Ko was a possibility there
Ruka: I guess the other South was in the wall still since no one had the 4th one. San An Ko is what again?
Psi: 3 concealed 3-of-kinds
Ruka: I was trying for it, but it’s hard not to call sometimes
Psi: Kan is shiny~~~~ I know the feeling

East 3-3:

Psi: ……. Caleb was going for Kokushi Musou (13 Orphans)…??? His discard pile looks like it would have been an ideal hand to aim for Chanta, Hon Itsu or possibly even Hon Rou Tou. Well… maybe not Hon Rou Tou but…
Ruka: It’s his favorite yakuman just because of how impossible it is to get. But yeah, our strategies aren’t exactly even roughly polished
Psi: ah~ a favourite Yakuman hand he keeps on going for… I see I see. I’d understand if it was an act of desperation but… he was winning and he was dealer… and he still went for that thing……. really must like it indeed
Ruka: You also gotta remember, we’re just playing for fun. If we were serious, hands wouldn’t even be shown in the pictures
Psi: true

East 4-1:

Psi: ummu, Josh could have gotten a Tsu I Sou I see (win with only Word tiles – dragons and winds). Though… why’d he throw away the Pei (North)…?
Ruka: Good question